The GTAIV PC Product Key (Serial Number, CD Key, etc.) from your Steam account, email receipt, or manual; The Unlock Request Code provided as part of the installation and activation process; Any error messages you have encountered during the installation Contributed By: FishOfPain. 2 1. For Grand Theft Auto IV on the PC, a GameFAQs Q&A question titled "Serial Number???". hi i am being asked to enter a serial: below is an unlock request code . what do i put in as the serial i put the unlock request code in but it fails . any ideas help please how do we find the serial code? when i launch the game it says serial and then below it it says unlock request code but i dont have a serial code where would i find it? Showing 1 - 7 of 7 comments Desypher Apr 1, 2013 @ 12:28pm Go to Library, GTA IV, right-click on it, then click CD-Key, and it should be there. :) #1 Scott140 Apr 1, 2013 @ 2:50pm Grand Theft Auto IV (PC) I haved bought this game for 3 month ago but can't figure out how to play this game o_O When i try to play online, it asks me for serial number and i don't know where can i find it then I decide to create offline account but it still asks me for the serial key, any idea? - More GTA IV serial code for you. Bet sure that your able to run the requirements of grand theft auto 4 or else the serial codes for iPhQh.