OH! MY BAD!
I'm very sorry! I didn't look at that page for a long-long time.
I just recently came back playing Minecraft, after skiping a few years, and I using MultiMC which can download an install FTB packs.
I just thought that with this new change, we get a new Twitch/Curse-like cursed thing that has no Linux support.
I just read this post, and dind't saw mentioning Linux.
Thanks for pointing me to the right direction! I will give it a try and see how it works.