Hi,
If you backed Rebuild on Kickstarter or preordered direct through
rebuildgame.com, you should have gotten an email from
humblebundle.com with info on how to pick up a direct copy and your steam key.
And entering your email address. There you can pick up direct download copies, your Steam key, and (if applicable) desktop versions of Rebuild 1 & 2. The PDF artbook will also appear there when the game is finished.
Please help.
Thanks!
I didn't find the right solution from the Internet.
References
http://forums.rebuildgame.com/viewtopic.php?f=2&t=839whiteboard videos