Hi @michal-roszak_0767 ,
This is a third-party / community plugin and we have no plans to maintain it ourselves. I hear it still works, but is a bit outdated.
HOWEVER, the former owner very recently "handed it over" to another community member. So this may mean we'll see some "new life" or changes -- I think they're still figuring out how to actually publish a new version, or something like that:
https://github.com/jenkinsci/inedo-proget-plugin
Thanks,
Alana