Based on v2.1.0.3 (v1.10) GOG release: 6,939,777,451 bytes
100% Lossless & MD5 Perfect: all files are identical to originals after installation
NOTHING ripped, NOTHING re-encoded
Registry entries created for future GOG-patches compatibility
Slightly smaller archive size (compressed from 6.5 to 5.3 GB)
Installation takes 8-15 minutes (depending on your system)
After-install integrity check so you could make sure that everything installed properly
HDD space after installation: 16 GB
OS: Windows 7
Processor: 2.4GHz Intel Core i3
Memory: 4 GB RAM
Graphics: Intel HD Graphics 4400
Storage: 16 GB available space