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