Quote: " It's downloading it to my Gaming system where Steam is installed. My Dev system is accross the room. "
Why are you so against installing it on your Dev computer?\It's a development platform after all.
EDIT: I just installed it on my MAME cabinet PC (my "gaming" computer). It installs fine. No extra key needed, just like every other Steam app. As an added bonus, I just realized I can stream content from my dev computer to the gaming PC through the Steam client. I didn't know I could do that, LOL. Works a treat! (A bit grainy, though, but usable) As far as moving assets from one to the other, if you're developing on one and playing on the other, why would you need to transfer those assets to the other? I don't get it, sorry, I'm not trying to be condescending.
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics