Help wanted with existing Transmission Flatpak

Project information:

Name: Transmission (GTK)
License: GPL-2 or GPL-3
Upstream has been contacted:

I created this Flatpak before Flathub existed because we needed a good, user-friendly BitTorrent client to be available to Endless OS users. Later I submitted it to Flathub.

I don’t have time to actively maintain this. Fortunately the rate of upstream releases is slow. But there are a couple of open issues including an update to the app runtime. Anyone interested in helping out?