If you see similar troubles to our fellows below with upgrading from Zapstore, and prefer not to use Play store, you can use direct downloads for the timebeing the issue with Zapstore is resolved:

Here is the APK published on Github:

https://github.com/minibits-cash/minibits_wallet/releases/download/v0.3.4-beta.19/app-arm64-v8a-release.apk


Here is the link to Zapstore CDN download with new version:
https://cdn.zapstore.dev/01a40098cec0e5eff3cf570752c356daabdbffc31536fa9cca162ce83dabee5b


SHA256: 01a40098cec0e5eff3cf570752c356daabdbffc31536fa9cca162ce83dabee5b