Steamfix by REVOLT that enables the wolfpack expansion for the original payday (technician tech tree along with 48 new levels + 2 maps - counterfeit and undercover + 3 weapons - stryker pistol / ak / gl40 + several masks)

It unlocks the DLC on the legit version OR - if edited with a custom appid - enables you to play the cracked version.

Everything is already set up, so just copy it to your payday the heist folder and you're good to go