Now, I'm not new to Minecraft modding, but since the method of dragging and dropping class files was phased out, I turned to forge and forge only.
With the new launcher, I've tried to install the old Rainbow XP mod for 1.7.4 to no avail. I just can't seem to get it to work. Can someone else try and let me know if they can get this mod working? Not even on 1.7.4, just any version. I miss that mod, haha.