For who, like me, have problem with the new patch (20/03/13) I found a solution
1: Delete the Folder AVA (You can found it in C:/AeriaGames/AVA)
2: Use CCLEANER and remove all the problem (Also repair the registers)
3: Reinstall and backup the file Ep-PrisonBreak.ut3 before the patch
4: Do the patch normally and it will start
Tried with 2 friends of mine that used to have this problem (I was havin' it too)
ATTENTION: YOU WILL PROBABLY REINSTALL AVA 2 OR 3 TIME
@Riddick I found a solution ^^
(Thank me if you found it usefull)
P.s. Sorry for uncorrect section