Before we do anything, we need the files!

Please download both as it is needed to access the Joker DLC.

Joker DLC Files: https://community.pcgamingwiki.com/files/file/511-batman-arkham-asylum-goty-steam-dlc-from-ps3/

Joker DLC Patcher: https://www.nexusmods.com/batmanarkhamasylum/mods/160

Adding the DLC files to our game files!

First, locate your Batman Arkham Asylum files in the following directory:
steamapps\common\Batman Arkham Asylum GOTY\BmGame

Once you have located the folder, drag the contents of the DLC zip file inside of the "BmGame" folder. Please note: If you are asked to replace files due to them already existing, select the option to replace the files!


Enabling the Joker DLC!

The last thing to do is to enable the Joker DLC and the easiest way to do that is by using a helpful tool called "Joker DLC Patcher".

If you need help using the tool, the "readme" file has a lengthy FAQ to help you out, however the on screen prompts are very much straight forward and tell you exactly where to go as seen here:

And that is it! You can now play as the Joker in the Batman Arkham Asylum challenge modes!