Fix to the Unkown Error FFFFFFFF

I bought Red Dead yesterday and istalled it but im not able to get any further than the loading screen after the Menu because of the Error. I tried every step to fix it according to Rockstar support but it seems there is no funktioning solution. Ive tried to update my GPU, and even changed the API to DX12 but its still the same. Do you guys have a solution ? ( i downloaded the Game on The Rockstar Launcher and i play on PC )