You can get the latest version 0.20.11 from https://f-droid.org/packages/org.schabi.newpipe/.
We went back to the "normal" #FDroid build process, so these APKs are signed by F-Droid again. If you installed an APK signed by us, you either need to uninstall the APK or add the official NewPipe repository to F-Droid: https://newpipe.net/FAQ/tutorials/install-add-fdroid-repo/
They can, if the builds are reproducible - which means some extra steps to ensure the apk provided by the developer is binary-identical to the one we build. For some reasons, that failed for Newpipe's recent versions. Please see their issue tracker for details. Not their fault, neither ours - "just" some technical problems...
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