You might uninstall Photoshop and reinstall. Be sure to use the Creative Cloud app to install.
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The safest and best way to uninstall and reinstall is to use the CC Cleaner Tool. Instructions and download link are at Use the Creative Cloud Cleaner Tool to solve installation problems
I am having the same issues: "Could not apply the select and mask workspace because the file could not be found". I also noticed that I cannot select the photography workspace"
I have uninstalled and reinstalled using Creative Cloud.
I am using Windows 10. It is very frustrating!