1. Download official Windows 11 ISO by registering for Windows Insider or any other source.
2. Now, download the WinRAR application to extract the contents of the ISO file.
3. In a few minutes, ISO contents will be extracted to a folder with the same name as the ISO file.
4. Now, double-click on the folder to open it.
5. Next, double-click on the sources folder to open it.
6. Locate the "appraiserres.dll" file and right-click on it. Select the Delete option from the context menu.
7. Click the Yes button when Windows prompts.
Windows 11 appraiserres.dll file is responsible for checking Secure Boot and TPM 2.0 on your PC. Since you have deleted it, Windows 11 installation will be no more able to check these features on your PC, and you can install it without any issues.
To upgrade your old Windows 10 to Windows 11, double-click on the setup file and follow onscreen instructions.
