What's not valid? the torrent, the save when you load it on the Xbox? Get your SID4 file here... http://forums.afterdawn.com/thread_view.cfm/311710
ok if it says it is not a valod game save when you try to put it on your ar then you are probrably not puting it in in .rar format. unrar the root file (ex. SID4NknaveEdition.rar) then transfer the launcher (ex. SID4.NK.Launcher.rar) then the loader for your game (ex. SID4.NK.Loader.Mechassault.rar) to your ar. do not unrar the launcher or the loader