Ok, i activated DirectPlay in Windows Components (y the fuck is this disabled???)
Then did a fresh install
Selected Vanilla FL Shader
The usual Error Code showed up
Deleted Launcher.ini
Selected Vanilla FL Shader again
Now it´s running flawlessly in Vanilla FL Shaders!!!!!
OMFG Exxo, thank you so muuuuuchhhh!!!!!
With other Shaders i still got the same Error Message