guggelhupf

hi i have a little problem and dk how to solve it. i wanted to play the Modpack Nevermine 3 Forgotten Worlds with a friend but a few minutes after i installed it its gone ( https://www.technicpack.net/modpack/nevermine-revived.623719.) and i see an "offline" note at the modpack. so the question is, what happend and how can we play together