I have the Epic Store version of this game. I read the guide on this wiki on how to patch the EXE but when I tried to find 25 00 00 08 00 31 86 80 with HxD, there were no results. Is there really no way to patch the Epic Store version?
Topic on Talk:Batman: Arkham Asylum
Oh wait, I found out about this https://drive.google.com/drive/folders/186peaBdlZpSo37UwrsZufHT7Db2WgSI1 & it seems to be working. I haven't tried out the DLC yet though.