These are the last releases which run on Android 4.1.2 (API level 16):
- F-Droid client app 1.12.1
F-Droid client app 0.102.3 was the last version with the original, clean GUI, but that does not support the “new” index format, hence I gave up using it. - Firefox mobile 68.0.2 (later 68.x.y releases should also work)
- Fennec F-Droid (a recompiled Firefox mobile, available at F-Droid) 68.12.0
This is not true, Storeman 0.1.8 from the Storeman-legacy page at OpenRepos works fine (tested on SailfishOS 2.2.1) when the CA certificates are updated and the OpenSSL 1.1.1+1.0.2 combi package is installed.