The current server is running All The Mods 10, version 7.0.

To ensure compatability please download and install All the Mods 10 (client version 7.0) via the Curseforge client. Curseforge ATM10

To connect, use the address "minecraft.aspekt.quest". The server is provided at the default 25565 port so it should work without port definition, but you could explicitly map it as "minecraft.aspekt.quest:25565" if you would like.