Parallels Desktop provides a virtual machine on the Macintosh, where for example Windows 11 can be operated. RFEM 6 can also be installed in this virtual machine.
The issue with graphical representation suggests a problem with OpenGL. Older versions of Parallels Desktop unfortunately only support the outdated OpenGL version. This problem does not occur in the current version of Parallels Desktop.
If it is not possible to switch to the current version of Parallels Desktop, installing the MESA drivers provides a solution. RFEM 6 is first installed normally within the virtual machine. Then, the instructions to enable the MESA software renderer in the virtual Windows environment from this FAQ are followed:
RFEM 6 should now be able to run without issues even in the old version of Parallels Desktop.