Board Thread:Bug Reports/@comment-26094198-20170513191913/@comment-27200931-20170513193121

You need to download and install Forge 1.7.10 - 10.13.4.1558 (the recommended version), or the mod won't work.
 * http://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.7.10.html

There's a tutorial for it here (If you didn't understand, don't worry, there are countless tutorials for installing Forge like this one, just search it on Youtube):
 * https://www.youtube.com/watch?v=sioqeA5xYRU