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Obtainium
(lm.ilyamikcoder.com)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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For some unknown reason this app. doesn't work for me. When I try to update any apps it just error out trying to install it. The debug logs in the app is also not helpful
Are you trying to install an update from GitHub to F-Droid app? This will not work because F-Droid apps built with different signature. You should uninstall F-Droid app in order to install updates from GitHub or Play Store. Or you can add source from F-Droid to keep updating app from there.