[adiadi]

I somehow got it working, after fiddling a bit with composer.json (but apparently back to the initial version) and doing a "composer clear-cache" several times.
If you get prompted for a token, don't bother generating one, it will not be accepted anyway (at least it wasn't for me, it says no token provided); hit Enter and it will go further.

Now that it's installed, the performance looks to be pretty poor. Whenever I get into the interface, it seems to be endlessly creating some thumbnails or whatever of the films in the Grid View; clicking upon any of them takes ages and I still didn't get any film to actually play over LAN...