Like some others here I was using fingerprint authentication to access the app and because it has been so long since I needed my master password I cannot remember it. Even if I could I am seeing other posts here where people are saying their correctly typed password isn't working, so maybe I am typing it correctly as I would have no way of knowing. Because of this, this automatic "upgrade" is anything but for me as I've lost access to all of my passwords.
I emailed support asking for an old APK to see if I could use my fingerprint by default in an older version but they responded with a generic "if you don't have your master password, you're out of luck" response. I have important notes and information in this app, so resetting is not an option for me.
If an old APK wouldn't work then enpass needs to address this with an update to allow fingerprints to be used by default, because this is a major issue. I paid for enpass, and I have told many people about it. I've always supported the app so please don't leave me and other users stranded.