Download and install Java 8 or 9 for whatever OS you are using.
Then Download MultiMC 5, and install it, and during the setup process make sure you allocate enough ram (min 4-6GB).
Then create a new instance and make it 1.12.2 then click on "edit instance" and install the forge version "forge 18.104.22.16806".
Then download the modpack from the link above, and unzip it.
After that, take the contents of the zipped folder, there should be 4 folders, and put them in the instances .minecraft folder.
That's it, should be just that easy, if you have issues, send screenshots and log files to firstname.lastname@example.org.
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