

Dev posted few weeks ago about donations being a little short and having lowered making it more difficult to support development. A lot of people then started to donate or increase their financial support.
Edit : for reference https://lemmy.ml/post/29579005
IMHO you need to use adb to force install older version. Something like :
adb install -r -d myapp.apk
Look it up! It should be possible to use termux on phone and connect wirelessly to your own phone to access adb. Or you have to use another device to connect to your phone.
Of course simpler solution is being able to backup settings and data, uninstall then install older version and restore data.