Board Thread:Dark Souls/@comment-71.192.217.193-20150315191517/@comment-4511886-20150315192347

Maxing your stats, regardless of if it's legitimate or through some sort of exploit, is barely ever worth it. If you really want to do it anyway, you have to have an unpatched copy. The data for AotA was added in a patch, and the PtD edition already features this patch, with no way to remove it. Either way, you can't access the DLC on characters created before you had said DLC. (According to what I've read.)

Long story short, you can only use the Dragon Head dupe glitch by having a non-PtD copy of the game, but that character will be unable to enter the DLC, atleast for the first NG cycle after getting it.