This is due to the textures and rig system being relatively large combined with four different variants. The mod's size is rather large (almost 1.8GB). Falemirious ripped the gatling gun model and sound effects himself.
Instructions for installing and using the mod can be found in the download's readme.txt file, and in the Tutorial Video below.
This version is a significant upgrade to the original Half-Life 2 mod, which used an older version of the Warfaremachine rig. In this Half-Life 2 Mod by Falemirous (or Gagnetar, or Maziblux), Krystal replaces the secondary companion character Alyx Vance.
