Hello !
If you have a CD version of AC Valhalla on Xbox and can't update the game, here is a workaround shared by @Ubi-Cintre in the French forum, it worked fine for some people :
If you can, install the Xbox App on your phone, then :
- Remove the CD from the Xbox
- Uninstall AC Valhalla
- Download AC valhalla using the phone Xbox App (it will be up-to-date)
This should work
[Source] (French forum) : https://discussions.ubisoft.com/topic/126370/impossible-d-installer/9?lang=fr&sort=newest_to_oldest