Hi.I'm trying to install rubix mod ,but when i but Jar and Json files to 1.6.4 version folder and start laucher he replaces the files with old the ones.
P.S Sorry for bad english.
Make a folder next to the 1.6.4 and call it "rubix". Then put in the two files inside that folder. Open your minecraft launcher and then set your minecraft version to "rubix".