This is a duplicate of calendars keep being turned on in calendar app (visibility) since update to 1.0x and it’s fixed with 1.0.4. Please follow up there if there are further problems.
Version for android 4.2.2
Is there any version to use with android 4.2.2. (Samsung A3 mini)?
You can use F-Droid Archive: https://forums.bitfire.at/post/5618
I have added an FAQ entry:
Maybe it helps
thank you, it works