Overview

Singleplayer Setup:

To make the installation process easier, I recommend using cubeLauncher: https://github.com/o7q/cubeLauncher

After downloading the modpack from this repository, extract the archive and drop & drag the contents onto the cubeLauncher window.

Multiplayer Setup:

After downloading the modpack from this repository, inside the ".cube" folder run the forge .jar executable installer.
Select install server and choose an empty directory.
Drag the mods and config folders into the server directory.
There are two client-only mods that cannot be ran on a server.

Ensure that both of these mods are removed from the server mods folder before starting:
~ 3dskinlayers-forge-1.4.6-mc1.18.2.jar
~ NekosEnchantedBooks-1.18.2-1.7.0.jar
(If you do not remove these mods it will result in a crash.)