If you are playing via Steam or GOG, your game likely updated to this version automatically. If you are using a standalone version, downloading the v1.174 patch from Patches-Scrolls or the official TaleWorlds site is recommended to ensure compatibility with modern multiplayer servers and the latest modding tools.
Since 1.174 is highly stable, several "all-in-one" mod packs have been built specifically for it: warband 1.174 | TaleWorlds Forums mount and blade warband version 1174 upd download