So I downloaded the Forge 1.15.2-31.1.0 files and extracted them and no where can I find where to actually Install? its just full of .json and .class files, and I cant find anyone else with this problem. all the videos iv been told about, they go to download, they get a file to click on and them bam they are done. I got absolutely none of that (Not one single Jar file anywhere either)