So i just installed the Assembly kit for Shogun 2 on the steam store. However i tried to play the game before even using the kit to check some unit names, and now it is reinstalling my entire game. All of my files are gone on my desktop as far as I can tell they have been replaced by the assembly kit. Game will not open and is forcing me to do a 15GB update? HELP please!!! Sorry if this is the wrong place but I am just looking for some assistance and I figure no better place to ask the experts. Thanks!