Normally the instructions to get it are on the page but I see that there was a problem with the translation, so I put the instructions below:

If you purchase a selected MSI item between 10/11/2010 and 31/12/2010, you will receive the game Assassins Creed Valhalla (Standard Edition) for free. This promotion is valid while stocks last.

REDEMPTION DEADLINE: 31.12.2020

Redemption process:

1. Go to https://de.msi.com/Promotion...
2. Create an MSI account or log in to your existing account
3. Register your product and upload an invoice or proof of purchase
4. Get Assassins Creed Valhalla for free and download your game via Ubisoft Connect

For full redemption instructions, terms and conditions and access to MSI customer service, please follow this link: https://de.msi.com/Promotion...

If you have any questions, please contact the MSI support team directly: https://register.msi.com/home...