Start the downloaded file and extract to a folder.
Go to directory(where you extracted)\Catalyst_8.782.1RC5_Win7_MLAA_Oct21\Pac kages\Drivers\Display\ and open CW106976.inf
Now download this .txt file
http://www.forum-3dcenter.org/vbulle...5&postcount=18. Now select with Ctrl+A and copy the modded lines into the inf.
Do the same with C7106976.inf in \Catalyst_8.782.1RC5_Win7_MLAA_Oct21\Packages\Driv ers\Display\W76A_INF\.
Now start the setup and the function should be unlocked in CCC.
Edit: People in the PCGH forum say GTA IV is working with MLAA! -
http://forums.guru3d.com/showpost.php?p=3746055&postcount=14