I have the Pro-version of Netguard v2.276 installed on my Smartphone (Android 8.0).
F-Droid tells me that v2.280 is downloaded and ready for installation (“install from unknown sources” is allowed).
But after pressing “install” I’m getting the error message “Fehler beim Installieren von NetGuard. Installation aufgrund eines unbekannten Fehlers fehlgeschlagen”
(in english this should be ~ “error while installing NetGuard. Installation failed due to an unknown error”).
Similar if I download the APK and try to install that, here I’m getting the message “App wurde nicht installiert” (~ App wasn’t installed).
I did not try yet to first uninstall NetGuard, and re-install it afterwards (because I’m afraid to be without NetGuard in case installation wouldn’t work either)
Any idea ? On other devices I ain’t have that problem, they are on NetGuard v2.280.
Did you get the pro version from the Google PlayStore? Or was it from F-Droid (I only see the regular “non-pro” version on F-Droid, but I may have missed it.
If your pro version came from the PlayStore, and the other version from F-Droid, then it may be a mismatched key problem. E.G., the pro version is signed with a different key by the author. Then you would have to uninstall it and install the 2.28 version on F-Droid.