Based on Steam release Build 5740551: 2.7 GB, thanks to valtrix1982!
Game version is: v1.0.1
100% Lossless & MD5 Perfect: all files are identical to originals after installation
NOTHING ripped, NOTHING re-encoded
Significantly smaller archive size (compressed from 2.7 GB to 711 MB)
Installation takes less than a minute
After-install integrity check so you could make sure that everything installed properly
HDD space after installation: 2.7 GB
At least 2 GB of free RAM (inc. virtual) required for installing this repack
Operating System: Windows 7
Processor: Intel Core i3
RAM: 4 GB
Video Card: GTX 660, R9 270
DirectX: 11
HDD Space: 2.7 GB