Still DisplayLink driver problems with Win8.1 (?)

[Slidebone]

I followed the troubleshooting steps after having installed the 7.5 M0 driver. Finally, the device does not appear as 'USB Display Adapters’ in the device Manager. When connection the Monitor to the computer. the computer display starts flashing. The Support tool says 'No DisplayLink product connected to PC'.
(Attached files as references - in German)
For me, it seems that the DisplayLink drivers do still have a problem with Win8.1. Especially, since we all do not get any feedback from the DisplayLink Team, while other threads are answered.