For months I've been wanting to use some of the old mods I have downloaded for forge 1.6.4, but forge refuses to launch despite me downloading 3 different versions, and this only happens to 1.6.4 as I know of. All other versions of forge I own, (1.7.10,1.8.9,1.11,1.12.2) don't have any of these issues. The issue, according to the Minecraft Launcher, is: "Failed to download file, the file contents differ from what was expected. legacy.json" It also gives a URL which it is getting the file from, filename, and it's path. I've tried searching online, but I didn't find anything related to my issue. Think someone can help me out?