The code you activate with Uplay (Ubisoft version's of Steam).
1. Launch Uplay PC, or download it from
https://uplay.ubi.com
2. Login to your Uplay account, or create a new one if you do not have one
3. Click the menu in the top left corner of the application
4. Click “Activate a key”
5. Enter your activation key in the input field ensuring you follow the instructions outlined on the page
6. Your game will be accessible in your GAMES library, where you can download, patch and launch it
7. The approximate size of the Download game file is 40 GB