ich erhalten eine Meldung, dass das Programm bekannte Kompatibilitätsprobleme aufweist und deshalb blockiert wird

The warning that is generated on the very first attempt at installing ScreenCorder on Vista is related to a specific component, namely “Windows Media”. This package comes pre-installed on Vista in a version higher than the one included in the ScreenCorder package and this results in the message “This program has known compatibility issues and has been blocked”.

It is safe to ignore this message as the package is already installed and up-to-date.