If you have already purchased the game but cannot find your key to activate a new installation of version 1.174, try these methods:
Patch 1.174 specifically added support for newer game keys, so ensuring you are on this version is vital for modern keys to work. Mount And Blade Warband Serial Key 1.174
Mount & Blade: Warband Serial Key 1.174: A Complete Activation Guide If you have already purchased the game but