Answer:
Basically, it is possible to operate RFEM 6 and RSTAB 9 in a virtual machine.
It may lead to problems with the graphic.
RFEM 6 und RSTAB 9 benutzen für die grafische Darstellung OpenGL. The graphics driver must support OpenGL 4.2 or later.
Some hypervisors allow you to use the hardware acceleration of the graphics card in the virtual machine. If possible, we recommend using this feature for RFEM 6 or RSTAB 9.
If it is not possible, installing the software renderer that comes with RFEM and RSTAB can solve this problem. The installation process is described in this FAQ:
The disadvantage of the software renderer is that all graphics operations have to be done by the CPU instead of the highly specialized GPU. This limits the graphics performance. When many users are working on the server at the same time, the problem is even worse.