Game not running after installing beta4

[Specialized S-Works]

Hello
After i install the beta4 update....the game load normal.
then i go to the track......the game not running....cant only out with control/alt/delete

I install the beta4 normal....not delete the beta3 version.

What a wrong....have i do delete the game complete before installing beta4?

Normally updating goes well without delete older versions.

Thanks for help

Greetings
Bert

[Schwoni]

u have to delete the old krp directory and the piboso filder in documents too

Then install beta 4 and it should work