Fix "The processor isn't supported" issue when upgrading to Windows 11

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When attempting to upgrade a Windows 10 virtual machine to Windows 11, The processor isn't currently supported for Windows 11 error message may pop up:

According to Microsoft, some processors aren't supported by Windows 11. However, according to Microsoft, if you choose to install Windows 11 on a device that does not meet these requirements, and you acknowledge and understand the risks, you can create the specific registry key values and bypass the check for TPM 2.0 and the CPU family and model. 

In this situation, perform the following steps:

  1. Install the latest Parallels Desktop 17 version. 
  2. Download Windows 11 ISO image from the Microsoft website.
  3. Make sure you have a virtual TPM chip added to the virtual machine. Instructions on how to add it to the virtual machine are presented in the Enable TPM section of KB 122702.
  4. Once the Windows 11 ISO is downloaded, mount the ISO to the virtual machine: make sure Windows is in focus, and in the top menu click Devices > CD/DVD > Connect image..., and select the downloaded ISO file.
  5. If the Windows installation wizard doesn't start automatically, go to This PC, open the DVD drive, and then run setup.exe and proceed with the upgrade.

    During the installation, you may encounter the following message:
    Click Accept to continue and proceed with the upgrade.

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