Easy way to Install Windows 11 on Unsupported Computers by replacing the compatibility check file

This method is more of an addition to methods 1 and 2. If you ran into compatibility check issues with those methods, where the Windows 11 setup would launch and then tell you your computer is incompatible, try this out.

The Windows setup has an “appraiser” service that checks to see if your computer meets the minimum hardware requirements for that version. It’s possible to replace the file in the Windows 11 setup with one from an older build of Windows 10.

Obtain an older Windows 10 ISO

In order to replace the Windows 11 DLL with one from Windows 10, you’ll actually need the setup for Windows 10. In my testing, trying to use build 21354 causes the same compatibility checks to apply. Using build 19043 causes the setup to crash.

For the best chance of success, download a copy of Windows 10 October 2018 (build 17763). You can find ISOs online, or use the HeiDoc Windows ISO Downloader tool.

Try to update to Windows 11 through Windows Update

Even though the compatibility check will normally prevent you from installing Windows 11, the setup should still be fully downloaded. If it isn’t, keep trying until it is, or use UUP Dump to manually download a Windows 11 ISO.

Extract the file from the Windows 10 ISO

Once the Windows 10 ISO is downloaded, simply double-click it to mount it as a drive. Windows will show it as a DVD drive with a name similar to CCCOMA_X64FRE_EN-US_DV9.
Navigate to the sources folder and find appraiserres.dll.
Copy that file somewhere convenient, like the desktop.

Copy the file to the Windows 11 setup (Windows Update)

Use File Explorer to navigate to C:\$WINDOWS.~BT\Sources. Depending on how your version of Windows is configured, you may need to enter this directly into the address bar in the File Explorer window.
Rename the appraiserres.dll in that folder to something like appraiserres1.dll.
Copy the appraiserres.dll file you extracted earlier into this folder.
Navigate to C:\$WINDOWS.~BT. Double-click the setup.exe file. Depending on your setup, there may be no .exe extension.

Copy the file to the Windows 11 setup (Windows ISO)

Burn the Windows 11 ISO to a USB drive using a tool like Rufus. For more details on how to do this, check out Burn Windows 11 to a USB in Method 3.
Navigate to the USB drive and open the sources folder.
Find appraiserres.dll and rename it to something like appraiserres1.dll.
Copy the appraiserres.dll file you extracted earlier into this folder.
Navigate to the USB drive again and double-click the setup.exe file. Depending on your setup, there may be no .exe extension.

Prevent the installer from checking for updates

For the greatest chance of success, before going through the upgrade process, disable checking for updates, as they may cause the setup to crash.

To do this, wait for the initial setup screen to show up, click the >>>>> text, and select >>>>>>. Then go through the setup like normal.

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