First of all I have a gaming laptop that is also used to program and do graphics/3D Modeling etc. It has a ssd drive as the main drive but I learned early that if I wanted to play games I had to use the secondary drive. No matter what I do it always fills up and I cannot uninstall anything to make room anymore. All my games I play and there is about a dozen or so all who need 20 gigs or more as some are over 100 gigs. They all understood my instructions and installed the whole game and stuff on my secondary drive. Games run fine on moderate to high performance graphics. 
Unfortunately this game does not understand my instructions and installed the first 20+ gigs on my secondary drive. Now its demanding 6 GB of space on my main drive which I do not have. No other game does this. Why is your game so special? 
Is there a work around that will force the installer to finish the install file on the secondary drive like other games? 