Their website says to get it on F-Droid: https://molly.im/download/fdroid/
But it’s not on there. Did it get delisted for some reason?
Their download page doesn’t make this clear: Molly is not on F-Droid.
Instead, the Molly project hosts an F-Droid-compatible repository, which you can configure your F-Droid client to use in addition to / instead of the F-Droid repository. If you do this, the downloaded software will come directly from the Molly developers, not from F-Droid.
Some people avoid this because it loses a layer of oversight. Others prefer it because it avoids a potential attack vector. You’ll have to decide for yourself whether it’s something you want to do.
It’s worth noting the reason why Molly isn’t available on F-Droid proper: it’s entirely F-Droid’s decision. F-Droid policy requires that developers support (or do not oppose) inclusion in F-Droid, which Signal’s developers haven’t. Signal’s developers are also hostile towards forks and do not want them interoperating with Signal. Thus, F-Droid does not allow Signal or any fork of Signal.
https://gitlab.com/fdroid/rfp/-/issues/2297
I am not really a fan of this decision, I don’t think it’s logical that an upstream can forbid a fork from being published anywhere - but that’s F-Droid’s call to make.
Add their repository: https://molly.im/fdroid/foss/fdroid/repo
It’s listed on Accrescent
Or you could get it directly from their github releases using obtainium if you don’t like to mix repos in to fdroid.
Add this repository to the F-Droid app.