The official releases are back on the evilsocket repository:
I pulled down the 1.3.6 arm64 packages, installed any dependencies they needed, and then installed the debs manually. Note that when you install the opensnitch_ui package, it will build some python libraries by hand (which is for cross-distro compatibility but HEAVILY frowned upon by Debian maintainers). Because when you turn off the screen, the Librem 5 clocks its RAM down drastically, and because building these python libraries is incredibly resource intensive, I highly recommend leaving your screen on throughout the whole process. I’ve noticed loads up into the 15-20 range when building these libraries. If for some reason things seem to freeze, you can forcefully halt the phone and try again after a reboot and it should complete.
Our goal is to have a version of the UI package that doesn’t have this pip install as part of the post-install script.
[Edited to add] This pip install is a one-time thing. After you get through it, those libraries are on the system so any future upgrades of the python UI package will be fast.