Cannot remove or update Nik Collection from Photoshop

I cannot update my Nik Collection in Photoshop 2021 oro 2022 to the Nik 5 Collection. the install program will not remove Nik Collection 4 or update it. Now, after I had to delete the update script file and download and run it several more time, it still will not remove the version 4 and that version no longer will work.

Hi and welcome here.

Uninstall Nik from Windows …
and reboot !

If that is not sufficient …