pull down to refresh
check out obtainium, you can subscribe to sources like github and if you like, include pre-release versions:
https://github.com/ImranR98/Obtainium/releases
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That's not the issue. The issue that if you already have a version signed for the play store you can't install a version from a different source.
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Can't install on top of my existing Zeus install from the play store, too bad.