Custom add to Direwolf?

Jan 26, 2020
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A couple of mates and I got bored of tekkit so have decided we want to move to the Direwolf20 1.12 pack, but also want to keep Galacticraft as its one of the more exciting mods within the pack. However none of us are entirely sure how to go about installing the mod into the pack and launch it on a server.

Pls help