Thanks for your reply. When I tried the demo, I was stuck on the blue splash screen with just the game's name. No progress. No "loading" bar or indicator. That's it.
The very first launch of the game can take a lot of time ( ~5/10 minutes). You just have to wait.
Next launches will be faster.
We're struggling with this issue for years. The game is just too big for the game engine :/
