Got a 15 year old laptop with intel P6100 processor 4GB internal memory with a HDD. Runs Windows 10 as a snail did only changed the HDD for a SSD running on Linux Ubuntu compared to Windows 10 it runs as lightning. 
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Windows 11 Pro 25H2 (insider preview) free upgrade installation on officially-unsupported outdated PC
- Thread starter dualazmak
- Start date
OP
- Thread Starter
- #22
This evening, I could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on really outdated tiny Intel NUC-PC.
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000
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OP
- Thread Starter
- #23
Today, I could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on my wife's really outdated desktop PC;
M/B: ASUS Rampage III GENE _chipset: IntelX58 (Tylersburg 365)
CPU: Intel Core i7-990X Extreme Edition (Gulftown)
MEM: 24 GB
OS SSD: 256 GB
GPU: NVIDIA GeForce GT 640
M/B: ASUS Rampage III GENE _chipset: IntelX58 (Tylersburg 365)
CPU: Intel Core i7-990X Extreme Edition (Gulftown)
MEM: 24 GB
OS SSD: 256 GB
GPU: NVIDIA GeForce GT 640
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OP
- Thread Starter
- #24
Today, I also could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on my wife's very much outdated ultra-light-small notebook/laptop mobile PC, NEC Lavie GZ;
M/B: NEC MS-1391 _chipset: Intel UM77 (Panther Point) Chipset
CPU: Intel Core i7-3571U (Ivy Bridge - M/B BGA ULV)
MEM: 4 GB
OS & DATA SSD: 2 TB mSATA (ORICO 2TB mSATA)
GPU: CPU incorporated Intel HD Graphics 4000
M/B: NEC MS-1391 _chipset: Intel UM77 (Panther Point) Chipset
CPU: Intel Core i7-3571U (Ivy Bridge - M/B BGA ULV)
MEM: 4 GB
OS & DATA SSD: 2 TB mSATA (ORICO 2TB mSATA)
GPU: CPU incorporated Intel HD Graphics 4000
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OP
- Thread Starter
- #25
Today, afternoon, I could upgrade one more PC!
I also could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on small and outdated PC in our dining room which has 55-inch Panasonic 4K (3840x2160 pixel) OLED TV as its PC monitor via HDMI connection.
M/B: ASUS B85M-E _chipset: Intel B85 (Lynx Point) Chipset
CPU: Intel Core i7-4790T (Haswell-DT Refresh)
MEM: 32 GB
OS-SSD: 120 GB
GPU: CPU incorporated Intel HD Graphics 4600 (HDMI to 4K 3840x2160 pixel 55-inch PANASONIC OLED TV TH-55HZ1800 as PC monitor)
I also could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on small and outdated PC in our dining room which has 55-inch Panasonic 4K (3840x2160 pixel) OLED TV as its PC monitor via HDMI connection.
M/B: ASUS B85M-E _chipset: Intel B85 (Lynx Point) Chipset
CPU: Intel Core i7-4790T (Haswell-DT Refresh)
MEM: 32 GB
OS-SSD: 120 GB
GPU: CPU incorporated Intel HD Graphics 4600 (HDMI to 4K 3840x2160 pixel 55-inch PANASONIC OLED TV TH-55HZ1800 as PC monitor)
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ShadowBoxer
Active Member
- Joined
- Apr 14, 2024
- Messages
- 244
- Likes
- 160
Last night I upgraded an "unsupported" i3 NUC with the aforementioned flyobee utility. Worked great! This utility automates a few of the manual steps from the technique proposed by the OP (ultimately arrives at the same Installing Server screen). You just point to the ISO, tick a few checkboxes, and it does the rest. eg it takes care of mounting the filesystem etc. and then presumably runs the "setup.exe /product server" command.
OP
- Thread Starter
- #27
This morning, I could successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on the two audio-dedicated outdated (unsupported) completely silent PCs (having USB3-port-connected OKTO DAC8PRO) in which I operate DSP EKIO, VB-AUDIO MATRIX, as well as JRiver MC; the two PCs are backup machines with each other (ref. #931 on my project thread wgere you can see inside photos of these completely silent PCs).
The first audio-dedicated completely silent PC;
M/B: ASUS P3Z68V PRO GEN3 _chipset: Intel Z68 (Cougar Point)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
The second audio-dedicated completely silent PC;
M/B: GIGABYTE Z77MX-D3H _chipset: Intel Z77 (Panther Point DH)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
The first audio-dedicated completely silent PC;
M/B: ASUS P3Z68V PRO GEN3 _chipset: Intel Z68 (Cougar Point)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
The second audio-dedicated completely silent PC;
M/B: GIGABYTE Z77MX-D3H _chipset: Intel Z77 (Panther Point DH)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
Ref. #931 on my project thread.
The OS (Windows 11 Pro) SSD is now (as of September 2025) 512 GB in both PCs.
The OS (Windows 11 Pro) SSD is now (as of September 2025) 512 GB in both PCs.
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OP
- Thread Starter
- #28
This afternoon, I could also successfully upgrade Windows 11 Pro 24H2 to 25H2 (OS build 26200.6584), by the method of "setup.exe /product server" which I shared in my post #1, on the two "unsupported" but still powerful and efficient enough PC-workstations in my upstairs office (for my business and hobby, handling audio tracks, photos, videos, heavy-and-huge PowerPoint files, HiRes medical images/videos (MRI CT PET SPECT X-Ray UltraSound...) etc., I do not play PC games; both connected to dual 27-inch WQHD monitor (dual EIZO EV2750) enabling 5120x1440 desktop.
The first PC-workstation;
M/B: ASUS P9X79 WS _chipset: Intel C600/X79 (Patsburg)
CPU: Intel Xeon ES-2697 v2 (Ivy Bridge-EP Opt.) 12-core, 24-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX TITAN (p2083)
The second PC-workstation;
M/B: ASUS X99E WS _chipset: Intel X99 (wellsburg-X)
CPU: Intel Xeon ES-2630 v3 (Haswell-EP) 8-core, 16-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX 970 Mini-ITX OC
In my next post, I will summarize the nine (9) unsupported PCs and PC-workstations so far upgraded to Windows 11 Pro 25H2 by the "setup.exe /product server" method shared in my top post #1.
The first PC-workstation;
M/B: ASUS P9X79 WS _chipset: Intel C600/X79 (Patsburg)
CPU: Intel Xeon ES-2697 v2 (Ivy Bridge-EP Opt.) 12-core, 24-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX TITAN (p2083)
The second PC-workstation;
M/B: ASUS X99E WS _chipset: Intel X99 (wellsburg-X)
CPU: Intel Xeon ES-2630 v3 (Haswell-EP) 8-core, 16-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX 970 Mini-ITX OC
In my next post, I will summarize the nine (9) unsupported PCs and PC-workstations so far upgraded to Windows 11 Pro 25H2 by the "setup.exe /product server" method shared in my top post #1.
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OP
- Thread Starter
- #29
As a present summary (as of September 18, 2025), by the "setup.exe /product server" method shared in my top post #1, I could so far successfully upgrade to Windows 11 Pro 25H2 (from Pro 24H2) on the following nine (9) officially "unsupported" PCs and PC-workstations.
So far, no trouble nor issue at all after the upgrade to Windows 11 Pro 25H2, including further Windows (25H2) Updates availability and applicability.
As for possible security concerns, on all of the Windows 11 Pro PCs and PC-workstations, I subscribe and fully utilize the latest version "ESET Internet Security" (as of today ver. 18.2.18.0).
1. old backup PC in my office (ref. post #1)
M/B: MSI ZH77A-G43 _chipset Intel H77 (Panther Point Base)
CPU: Intel Core i7-3770 (Ivy Bridge DT)
MEM: 16 GB
OS-SSD: 128 GB
GPU: CPU incorporated Intel HD Graphics 4000
2. tiny Intel NUC-PC monitoring internet access router and LAN traffic, in my office (ref. post #22)
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000
3. my wife's desktop PC (ref. post #23)
M/B: ASUS Rampage III GENE _chipset: IntelX58 (Tylersburg 365)
CPU: Intel Core i7-990X Extreme Edition (Gulftown)
MEM: 24 GB
OS-SSD: 256 GB
GPU: NVIDIA GeForce GT 640
4. my wife's ultra-light small notebook/laptop mobile PC (ref. post #24)
M/B: NEC MS-1391 _chipset: Intel UM77 (Panther Point)
CPU: Intel Core i7-3571U (Ivy Bridge - M/B BGA ULV)
MEM: 4 GB
OS & DATA SSD: 2 TB mSATA (ORICO 2TB mSATA)
GPU: CPU incorporated Intel HD Graphics 4000
5. small PC in our dining room connected to 4K OLED 55-inch TV PANASONIC TH-55HZ1800 (ref. post #25)
M/B: ASUS B85M-E _chipset: Intel B85 (Lynx Point)
CPU: Intel Core i7-4790T (Haswell-DT Refresh)
MEM: 32 GB
OS-SSD: 120 GB
GPU: CPU incorporated Intel HD Graphics 4600 (HDMI to 4K 3840x2160 pixel 55-inch PANASONIC OLED TV TH-55HZ1800 as PC monitor)
6. audio(-visual)-dedicated completely silent PC No.1 in living-listening room (ref. post #27)
M/B: ASUS P3Z68V PRO GEN3 _chipset: Intel Z68 (Cougar Point)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
7. audio(-visual)-dedicated completely silent PC No.2 in living-listening room (ref. post #27)
M/B: GIGABYTE Z77MX-D3H _chipset: Intel Z77 (Panther Point DH)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
8. PC-workstation No.1 in my office connected to dual 27-inch WQHD monitor (dual EIZO EV2750) enabling 5120x1440 desktop (ref. post #28)
M/B: ASUS P9X79 WS _chipset: Intel C600/X79 (Patsburg)
CPU: Intel Xeon ES-2697 v2 (Ivy Bridge-EP Opt.) 12-core, 24-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX TITAN (p2083)
9. PC-workstation No.2 in my office connected to dual 27-inch WQHD monitor (dual EIZO EV2750) enabling 5120x1440 desktop (ref. post #28)
M/B: ASUS X99E WS _chipset: Intel X99 (wellsburg-X)
CPU: Intel Xeon ES-2630 v3 (Haswell-EP) 8-core, 16-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX 970 Mini-ITX OC
So far, no trouble nor issue at all after the upgrade to Windows 11 Pro 25H2, including further Windows (25H2) Updates availability and applicability.
As for possible security concerns, on all of the Windows 11 Pro PCs and PC-workstations, I subscribe and fully utilize the latest version "ESET Internet Security" (as of today ver. 18.2.18.0).
1. old backup PC in my office (ref. post #1)
M/B: MSI ZH77A-G43 _chipset Intel H77 (Panther Point Base)
CPU: Intel Core i7-3770 (Ivy Bridge DT)
MEM: 16 GB
OS-SSD: 128 GB
GPU: CPU incorporated Intel HD Graphics 4000
2. tiny Intel NUC-PC monitoring internet access router and LAN traffic, in my office (ref. post #22)
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000
3. my wife's desktop PC (ref. post #23)
M/B: ASUS Rampage III GENE _chipset: IntelX58 (Tylersburg 365)
CPU: Intel Core i7-990X Extreme Edition (Gulftown)
MEM: 24 GB
OS-SSD: 256 GB
GPU: NVIDIA GeForce GT 640
4. my wife's ultra-light small notebook/laptop mobile PC (ref. post #24)
M/B: NEC MS-1391 _chipset: Intel UM77 (Panther Point)
CPU: Intel Core i7-3571U (Ivy Bridge - M/B BGA ULV)
MEM: 4 GB
OS & DATA SSD: 2 TB mSATA (ORICO 2TB mSATA)
GPU: CPU incorporated Intel HD Graphics 4000
5. small PC in our dining room connected to 4K OLED 55-inch TV PANASONIC TH-55HZ1800 (ref. post #25)
M/B: ASUS B85M-E _chipset: Intel B85 (Lynx Point)
CPU: Intel Core i7-4790T (Haswell-DT Refresh)
MEM: 32 GB
OS-SSD: 120 GB
GPU: CPU incorporated Intel HD Graphics 4600 (HDMI to 4K 3840x2160 pixel 55-inch PANASONIC OLED TV TH-55HZ1800 as PC monitor)
6. audio(-visual)-dedicated completely silent PC No.1 in living-listening room (ref. post #27)
M/B: ASUS P3Z68V PRO GEN3 _chipset: Intel Z68 (Cougar Point)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
Ref. post #931 on my project thread.
The OS (Windows 11 Pro) SSD is now (as of September 2025) 512 GB in both PCs.
The OS (Windows 11 Pro) SSD is now (as of September 2025) 512 GB in both PCs.
M/B: GIGABYTE Z77MX-D3H _chipset: Intel Z77 (Panther Point DH)
CPU: Intel Core i7-2600S (Sandy Bridge-DT)
MEM: 16 GB
OS-SSD: 512 GB
GPU: CPU incorporated Intel HD Graphics 2000
8. PC-workstation No.1 in my office connected to dual 27-inch WQHD monitor (dual EIZO EV2750) enabling 5120x1440 desktop (ref. post #28)
M/B: ASUS P9X79 WS _chipset: Intel C600/X79 (Patsburg)
CPU: Intel Xeon ES-2697 v2 (Ivy Bridge-EP Opt.) 12-core, 24-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX TITAN (p2083)
9. PC-workstation No.2 in my office connected to dual 27-inch WQHD monitor (dual EIZO EV2750) enabling 5120x1440 desktop (ref. post #28)
M/B: ASUS X99E WS _chipset: Intel X99 (wellsburg-X)
CPU: Intel Xeon ES-2630 v3 (Haswell-EP) 8-core, 16-thread
MEM: 64 GB
OS-SSD: 512 GB
GPU: NVIDIA Geforce GTX 970 Mini-ITX OC
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gberchin
Active Member
As far as I can tell 24H2 is a Windows 11 version. So you are upgrading from an "unsupported" PC already running Windows 11 24H2 to the same "unsupported" PC running Windows 11 25H2 ... why is it surprising that one Windows 11 version can be upgraded to another Windows 11 version?
I have several Windows 10 22H2 "unsupported for Windows 11" computers. Can they be upgraded to Windows 11 by this method?
I have several Windows 10 22H2 "unsupported for Windows 11" computers. Can they be upgraded to Windows 11 by this method?
ShadowBoxer
Active Member
- Joined
- Apr 14, 2024
- Messages
- 244
- Likes
- 160
From Win-10 to Win-11.
OP
- Thread Starter
- #33
Since many new safety/security and robustness features have been implemented/improved in new 25H2. Furthermore, most advanced (in Microsoft Windows) many Windows Updates will be periodically semi-automatically applied to new 25H2 throughout at least coming 2 or 3 years.
As for possible safety/security concerns on unsupported PCs, I always subscribe full set of the latest "ESET Internet Security" in all the Windows PCs.
Yes, I believe so, since the procedure shared in my post #1 uses .iso DVD image of the whole Windows 11 25H2, even though I myself upgraded from Windows 11 Pro 24H2 to 25H2.
I know several successful case reports, including above #32 @ShadowBoxer's case, of upgrading Windows 10 to Windows 11 25H2.
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OP
- Thread Starter
- #34
I (we) still do not know (as of today) whether the official public version Windows 11 25H2 DVD-installer .iso Image to be announced/released very soon (hopefully in the beginning of October 2025?) would still (officially or unofficially) support the "setup.exe /product server" command by which we can bypass all of the TPM-Check CPU-Check MEM-Check SecureBoot-Check, or not.
I assume/believe it will be supported again by the coming-soon official public release of 25H2, since the already available "Insider Preview" 25H2 .iso, very near (or almost identical) to the official public version of 25H2, do support the "setup.exe /product server" command as I shared on this thread.
Nevertheless, if people have intention (I highly recommend so) of upgrading Windows 10 and or Windows 11 to Windows 11 25H2 on unsupported-outdated PCs, I would like to recommend at least get/download and keep presently available Windows 11 25H2 DVD-installer .iso "Insider Preview" of your language which supports "setup.exe /product server", before the "Insider Preview" version will disappear very soon.
I assume/believe it will be supported again by the coming-soon official public release of 25H2, since the already available "Insider Preview" 25H2 .iso, very near (or almost identical) to the official public version of 25H2, do support the "setup.exe /product server" command as I shared on this thread.
Nevertheless, if people have intention (I highly recommend so) of upgrading Windows 10 and or Windows 11 to Windows 11 25H2 on unsupported-outdated PCs, I would like to recommend at least get/download and keep presently available Windows 11 25H2 DVD-installer .iso "Insider Preview" of your language which supports "setup.exe /product server", before the "Insider Preview" version will disappear very soon.
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gberchin
Active Member
The "Insider Preview" 25H2 is only available to Windows Insiders. How does one become an Windows Insider?
Torin Krell
Active Member
- Joined
- Jun 28, 2025
- Messages
- 110
- Likes
- 131
Thanks for all the useful information on installing Windows 11 on unsupported hardware! For older and/or less capable computer systems I recommend Q4OS - a Linux distro with very low computer resource requirements. It is a lightened version of Debian Linux which will run swiftly on minimal hardware yet still retain most of Debian's functionality. I also found (after over 40 installs on a variety of older desktops and laptops) that Q4OS has run impressively well on all of them without the compatibility and performance issues I experienced with some other light Linux distros. After testing dozens of light Linux distributions, Q4OS is certainly my go to OS for any older and / or less performant computer system.
OP
- Thread Starter
- #37
Everyone who has Microsoft Account can join the "Windows Insider Member Program and Preview Downloads".
To become a Windows Insider;
https://www.microsoft.com/en-us/windowsinsider/about-windows-insider-program
OP
- Thread Starter
- #38
Yes, I know well your points.
As I shared in my post #20, just for your reference, for two of my outdated PCs, I have been, and I am, testing Ubuntu/Linux OS and Chrome OS, having three independent bootable 256 GB or 512 GB OS-SSDs of Windows 11 Pro, Ubuntu, Chrome OS, respectively; the three SSDs can be physically and completely-independently replaced/exchanged via SATA and SATA-power cables that are pulled-out to the front of the each PC case/chassis.
In my audio-(visual)-dedicated two completely silent PCs in my living-listening room, however, I still do need the latest Windows OS, since I have been sticking to DSP EKIO (only for Windows), VB-AUDIO MATRIX (for Windows), JRiver MC, OKTO DAC8PRO and its ASIO driver, etc; all of them have been, and are now, working perfectly for my audio-(visual) enjoyments (ref. here #931 and #1,009 on my project thread for the details and the latest system setup.)
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OP
- Thread Starter
- #39
Today, onto my "officially unsupported" Windows 11Pro 25H2 PCs (ref. my post #29), a Windows Update KB5065789 (26200.675) automatically arrived on-line and it was successfully applied automatically; now the version of Windows 11 Pro 25H2 is "26200.6725".
By the way, as I wrote in my post #29, for possible security concerns, on all of the Windows 11 Pro PCs and PC-workstations, I subscribe and fully utilize the latest version "ESET Internet Security" (as of today ver. 18.2.18.0).
I also set "OFF" against all of the Microsoft's "constant personal data collection attempts", as far as possible, including the "copilot" and "one-drive" features. Furthermore, usually my Windows operates/runs in "local account", I hate "Microsoft account", as many of you may agree.
By the way, as I wrote in my post #29, for possible security concerns, on all of the Windows 11 Pro PCs and PC-workstations, I subscribe and fully utilize the latest version "ESET Internet Security" (as of today ver. 18.2.18.0).
I also set "OFF" against all of the Microsoft's "constant personal data collection attempts", as far as possible, including the "copilot" and "one-drive" features. Furthermore, usually my Windows operates/runs in "local account", I hate "Microsoft account", as many of you may agree.
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OP
- Thread Starter
- #40
Hello everyone,
This is an important follow-up of my above posts #34 and #39.
Finally, as of today, October 1 2025 Japan Time, Microsoft officially and generally released Windows 11 25H2.
https://www.windowscentral.com/micr...wnload-all-28-languages-here-for-x64-or-arm64
I quickly downloaded the .iso x64 installer of Windows 11 Pro 25H2 Japanese language:
26200.6584.250915-1905.25h2_ge_release_svc_refresh_CLIENT_CONSUMER_x64FRE_ja-jp.iso (7.12 GB)
and I could confirm the command "setup.exe /product server" is still supported for preservative-upgrade-installation (preserving/keeping all the applications and files) in "officially unsupported" outdated PCs, avoiding/bypassing all of the TPM-check, CPU-check, MEM-check, SecureBoot-check, etc.
Edit:
Now, it has been confirmed that the "Insider Preview Windows 25H2 x64 26200.6584 installer .iso" (ref. #1) and the today's "Official General Windows 25H2 x64 26200.6584 installer.iso" (ref. #40) are exactly the same with each other, as I (we) expected.
This is an important follow-up of my above posts #34 and #39.
Finally, as of today, October 1 2025 Japan Time, Microsoft officially and generally released Windows 11 25H2.
https://www.windowscentral.com/micr...wnload-all-28-languages-here-for-x64-or-arm64
I quickly downloaded the .iso x64 installer of Windows 11 Pro 25H2 Japanese language:
26200.6584.250915-1905.25h2_ge_release_svc_refresh_CLIENT_CONSUMER_x64FRE_ja-jp.iso (7.12 GB)
and I could confirm the command "setup.exe /product server" is still supported for preservative-upgrade-installation (preserving/keeping all the applications and files) in "officially unsupported" outdated PCs, avoiding/bypassing all of the TPM-check, CPU-check, MEM-check, SecureBoot-check, etc.
Edit:
Now, it has been confirmed that the "Insider Preview Windows 25H2 x64 26200.6584 installer .iso" (ref. #1) and the today's "Official General Windows 25H2 x64 26200.6584 installer.iso" (ref. #40) are exactly the same with each other, as I (we) expected.
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