Upgrade Failure Observed in v21.1.26691 on Windows 11 VM

We are currently testing the upgrade and fresh installation process on a Windows 11 virtual machine.

In the v21 series (latest version: 21.1.26691), the following behavior has been identified:

• Upgrade from N-1 (21.1.26688) to 21.1.26691 - Fails
• Upgrade from N-2 (21.1.26548) to 21.1.26691 - Succeeds
• Fresh installation of 21.1.26691 - Succeeds

Additionally, upgrading N-1 (21.1.26688) from N-2 (21.1.26548) completes successfully.

All the above scenarios were tested via both UI and system context.

During the upgrade process, the operation is rolled back, and the following prompt is displayed:

The same issue occurs on a 32-bit OS as well.

Logs have been attached for reference.

 

PFA - Install.log file

 

Hello has been resolved in the 21697 release !
https://en.rasinsider.com/parallels-ras-core-v21-1-1-2-26697-previous-bug-fixed/

 

To resolve the issue quickly:

• Enable vTPM and Secure Boot: Ensure your Windows 11 virtual machine configuration has Trusted Platform Module (vTPM) and Secure Boot enabled in your hypervisor settings (Hyper-V, VMware, or VirtualBox).
  
  
• Clear Temporary Setup Files: Purge the software cache directory and re-download the clean installer payload.
  
  
• Run as Administrator: Execute the upgrade installer manually from an elevated command prompt.
  

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