Hello,
I just buy, download, start, sign in to Papyrus 12.
As soon as I start it, I get two errors:
Do you need some more information?
Uff! I’ve not seen these errors before. 
When you click OK on those error messages, does Papyrus run normally?
Here are two quick things to try:
Check that Papyrus has Full Disk Access
Here’s Apple’s guide on it: Controlling app access to files in macOS - Apple Support
Re-install Papyrus
Just to make sure everything’s in order, and so we can rule out the possibility of an interrupted installation.
Thanks for the screenshots! They’re always super helpful. 
Re-instalation solve the problem! Thanks.
(although “verification”, MacOS built in process, before starting first time Papyrus went without any errors so I assume that everything was ok with installation… for second time, I use same installation DMG file as first time! Really strange…)
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