After more than ten years of using Poser, I made this drill my mandatory procedure:

1. Make a FULL backup of the Poser program folder!

2. also make a FULL backup of any files and folders saved in "C:\Users{mysername}\AppData\Roaming" (i.e.all folders related to Poser)

Then I run the update / reinstall and let it do whatever it wants to do. If something is broken I can always copy the broken settings/files/libraries back. Usually that remedies all the frills and glitches Poser still (!) has.

HTH

Peter