You simply need to download the pack for your desired language first. If you wish to play the game with another audio language, you can. The menu and subtitles will be available several languages included in your game version. Whether you own a digital or physical version of Assassin's Creed: Origins, it will contain only one audio language at first: English.
Significantly smaller archive size (compressed from 43.6 to 9.1~16.7 GB, depending on selected components).
Selective Download feature: you may skip downloading and installing of AC Liberation files and voiceovers/videos for languages you don’t need.100% Lossless & MD5 Perfect: all files are identical to originals after installation.