tried all versions from 9.3.3 to 9.3.8, been reinstalling inception at least 10 times - still no way... all of the other unrestricted-sys-ui plugins from both authors work good… and this strange "Can't install" issue - now, after I incepted libqoauth and quick-status-updater manually this message doesn't appear any more upon starting the installation of the packages that previously been invoking it... really strange, hope it's solved - not really in a mood to try it with the latest version - going to try it after few days of break from unrestricted-sys-ui installing ... will feedback, of course...