The following error had occured when I launched RIFE-App V2.80 for the first time.

qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""

How do I fix it?

I didn't edit any V2.80 files including "~/desktopdir/RIFE-App/PyQt5/". V2.11 is working on same environment.

I think it may be some problem with the path of the folder. Can you try to put it into a simple folder like "c:/Rife-App" and see if it work?