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Everything is in the archives you can download.
It's quite easy really:
2. Know what version you have of the game.
(If updated game on Steam then 1070.)
2 bis. You can also downgrade your game to 1040 for best graphics if you don't mind about MP.
3. Copy the content of the folder you choose depending of your version
4. Paste it in the root of your game.
5. Replace if it asks ( BE CAREFUL THAT YOU SHOULD HAVE BACKUP YOUR GAME BEFORE YOU DO SO)
6. Launch your game.
Nice, thanks. Yeah I'll definitely download it when I get home then. I took Sannakji's comment as it was a complicated install, but it looks ok. Can't wait.