I've retested that and indeed have the same result. Not sure why, because I can download the APK from both Github and Zapstore CDN without issues.
Here is the APK published on Github that Zapstore downloads when publishing new release:
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:
https://cdn.zapstore.dev/01a40098cec0e5eff3cf570752c356daabdbffc31536fa9cca162ce83dabee5b
SHA256: 01a40098cec0e5eff3cf570752c356daabdbffc31536fa9cca162ce83dabee5b
Sorry for troubles not sure why it's not downloading from Zapstore app, links on thir web https://zapstore.dev/apps are updated and pointing to the new release.