si t'as des problèmes :
1. Log in to the Larianvault: https://www.larianvault.com (*)
2. Click on the D:OS Kickstarter link in the top menu
3. In your list of rewards, you will find an item called "Divinity: Original Sin Alpha Access" with an ALPHA logo next to it
4. Click on the "Now accepts your input" link
5. Next to Alpha, click on the OK button to accept Alpha on Steam (there is no other distribution possibility)
6. Next to Alpha, click on the link "Available! Claim now! (Steam)" to get your personal Steam key for ALPHA
7. A Steam key will be assigned to you. This key can only be used once. To redeem it, open the Steam application. In Steam, click on the "Games" menu, and choose "Activate a Product on Steam". You can copy paste the key in this wizard to activate the ALPHA build of Divinity: Original Sin
Perso je préfère tout de même attendre le jeu final, surtout pour 10-15h de jeu bugguées 