Error Message: This functionality is currently not available

For more than a year, I have used NIK Collection 5 plug-ins with PSE 2021.  I have been having issues with PSE freezing intermittently, and this recently occurred while I was editing an image using Viveza.  To unfreeze the screen I clicked on control+alt+ delete to access the task manager. I clicked on PSE to unfreeze. From that point on PSE does not recognize Viveza (although Viveza appears on the drop down list in PSE Editor). When I click on Viveza, I get the error message: This functionality is currently not available.  I can use Viveza as a standalone, but I prefer the PSE workflow.

I uninstalled and reinstalled NIK Collection 5.   I tried resinstalling Viveza using Preferences. 

Should I uninstall NIK Collection 5 from PSE?  Then reinstall? And if so, how do I do that?

Thanks