Copy it intoto C:\Riot Games\League of Legends\RADS\projects\lol_air_client\releases\0.0.1.51\deploy\lib. You can back up the existing file if you wish, otherwise you may need to repair your client later. Open the client and create a custom game. The new custom game will be a duplicate pick game regardless of your actual choice of mode (blind pick, aram, etc). - See more at: http://www.mobafire.com/league-of-legends/blog/satella/how-to-play-5v5-same-champions#sthash.bbMPQ9dG.dpuf