Based on Steam release Build 5510896 with all three episodes included: 16 GB, thanks to chronos!
Goldberg emu/crack applied over
100% Lossless & MD5 Perfect: all files are identical to originals after installation
NOTHING ripped, NOTHING re-encoded
Significantly smaller archive size (compressed from 16 to 9 GB)
Installation takes 5-14 minutes (depending on your system)
After-install integrity check so you could make sure that everything installed properly
HDD space after installation: 16 GB
Language can be changed in game settings
Repack uses XTool library by Razor12911
At least 2 GB of free RAM (inc. virtual) required for installing this repack
Operating System: Windows 7 64-bit
Processor: Intel core i3 4130 (3.4 Ghz 2C / 4T) AMD FX 4300 (3.8 Ghz 4C / 4T)
RAM: 4 GB
Video Card: Nvidia GTX 750Ti or Nvidia GTX 1050 or AMD Radeon R7 260X or AMD Radeon RX 560
DirectX: 11
HDD Space: 16 GB