Work arounds are no longer necessary.  Through collaboration between Microsoft and ProSeries developers, a solution has been found. It involves downloading a MSI file and editing it.  

Steps to repair Windows 11 to allow ProSeries 2021 (and prior years) to Save (this includes Printing/Efiling/Restoring client files)

1. Download the Microsoft MSI file from this link
   • Win11_KB5026446_Issue_Rollback.zip
2. Unzip the file (Win11_KB5026446_Issue_Rollback.zip)
3. Double click the unzipped msi file (Windows 11 22H2 KB5026446 230427_03057 Known Issue Rollback.msi) to install it
   • Installing this msi could trigger your computer to reboot

After installing the MSI file, its group policy needs to be edited

1. Open gpedit.msc. (edit group policy)
   1. Go to Windows Search
   2. Type gpedit.msc
   3. Then double click the Edit Group Policy, to launch it
2. Find the following
   1. 
   2. Under Computer Configuration
   3. Then Administrative Templates
   4. Then KB5026446 230427_Known Issue Rollback (For Testing Purposes Only)
   5. Then Windows 11, version 22H2
3. Double-click on the highlighted item.
   • KB5026446 230427_03057 Known Issue Rollback (For Testing Purposes Only)
4. Configure it as "Disabled"
   1. Select the Disabled bullet
   2. Then press Ok
5. Reboot the machine and test ProSeries 2021 (and/or prior years).
   • save client
   • print client return/letter/invoice