So far there's a downloader, even though their FAQ mentions a choice between direct download and downloader (I didn't find an option for a direct download, though).
I assume there's no extra client required after download, but I can't say for sure, because I'm still downloading, sorry.
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This will not give you a Steam key!
Details can be found here
TL;DR:
1) Create account
2) Add the game to the cart
3) Apply coupon code CHIP-GT2 during checkout and you'll see that the game is 100% discounted
4) Enjoy!
This will not give you a Steam key!
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