APKMirror and APKPure have worked well for me in the past, never seemed to have an issue with malicious modifications.
this post was submitted on 10 Feb 2024
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Piracy
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f-droid for FOSS apps.
edit: misclick. I meant this as a reply to the OP.
In this case, it's not foss, it's an unpublished app, so the case is more akin to piracy
You can set up a VM using VirtualBox with x86 android and try the apks you find online till you get a working one, but a lot of apps are just a iframe to a website.
It's also possible that the app is delisted because it hasn't been updated for too long to support your device.
But anything that's not an official source can't be guaranteed to be malware free.
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