

This finally worked for me!
I have the game installed to other storage (F) than windows (C).
Follow this links orders: https://www.reddit.com/r/assassinscreed/comments/jrc7pu/fix_for_infinite_splash_screen/
NO need for me to do that first fix which "works for Origins"
Just follow the steps below that steamcommunity link..
And yeah run as adminstrator, just for sure.
Takes max 5 minutes!