I installed the version from F-Droid-Store, Version 0.6-something. The main problem for me was, that you couldn’t download single songs, only complete albums - and I gave up on the App.

This post made me install the 0.9-beta-APK (directly from github), and it already fullfills all my wishes, you can download single songs now! And I love that you can filter for your favorites and download them all at once. Really looking forward to further process, it’s so promissing.

Cloudflare scares me, they have way too much power. Maybe look for alternatives instead. Best case they are not from the USA, their demand for privacy and security is going down the drain faster than you can blink.