Yeah, I found out here that a new version has been published on Openrepos, I was using another one and didn't know there was now an alternative. Thanks! As for N26, version 3.9 downloaded from Aptoide seems to work. The application is stamped as trusted for this version, but I am still not so confident about using a banking application uploaded by a user on Aptoide, even though it successfully passed the malware checks. I don't understand however why the version that I had on my Jolla C (whatever version it is) refuses to install on Sailfish X.