Here's how I did it:
After installation of the 9.0 beta, the Profiler is found as one of the audio outputs in Windows:
Then, the ASIO4ALL audio driver 'sees' the Profiler as an available WDM Device:
In Cubase, the Profiler input- and output ports are available. This is a Profiler Powered Rack, so only In 1&2 and Out 1&2:
The outputs can then be connected in the Cubase Control Room:
...and done!