Based on Steam release Build 5674159: 5.8 GB, thanks to chronos!
Goldberg emu/crack applied over
In-game version: build 99102; 3 DLCs (Early Access Gift, Alpha Test 2018 Gift, Alpha Test 2019 Gift) are included and activated
100% Lossless & MD5 Perfect: all files are identical to originals after installation
NOTHING ripped, NOTHING re-encoded
Significantly smaller archive size (compressed from 5.8 to 3.4 GB)
Installation takes 3-6 minutes (depending on your system)
After-install integrity check so you could make sure that everything installed properly
HDD space after installation: 5.8 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