publius

For what it's worth, Version 6.12.3 (2594) on Mac still wasn't able to activate. WARNING for anyone about to try uninstalling on Mac: the instructions tell you to "Find and remove any folders named Enpass or in.sinew.Enpass-Desktop" in your Library folder. By default backups of your vaults will go into one of these folders. You will need to move them somewhere safe before following these instructions. You can do this by changing the backup location in Manage Vaults > Backups. I ended up completely uninstalling using the official instructions here, https://help.enpass.io/personal/latest/all/resetting-enpass#Resetting-Enpass-by-uninstalling-the-app,-and-deleting-all-Enpass-data and was able to activate after reinstalling.

This has also been happening for me on Mac for several months. Enpass suddenly forgot that I had ever registered and began running in trial mode. Every update I try to reactivate and every update it says "Could not connect to the server." on the activation modal. I'm currently running 6.12.2 (2560) from the Mac App Store. I tried installing little snitch to see what connection failed, and nothing at all was captured. As if Enpass didn't try any network connection at all before failing.