For automatic updates and easy installation, you can purchase and download the game through major retailers:
Remember to always be cautious when downloading software from third-party websites, and ensure you're downloading from a reputable source.
The full setup file should be roughly 1 GB to 1.5 GB.
GOG offers the DRM-free version of Warband . Their offline installers are legendary for modding because you can keep a backup of the 1.174 installer on an external drive forever.