ProtonVPN did an API bump in this version: Version 2.7.56.1 (2021-06-18) which left everyone with an Android version older than AOS 6 in the dust. So I went to the archives and grabbed the version just before that one. Ran it for the first time, configuration wizard had no issues but as soon as I tried to reach out to the server it refused to stand up a tunnel saying my version was too old. Not only did they leave permacomputing folks behind for sustaining their still-quite-functional devices, but they proactively sabotaged us from the server side.