I thought so, too. Looks like I can not test the v6 file with v5.
I assigned the model by doubleclicking the footprint in the PCB editor. From the “3D models” tab I added the STEP (.stp, I assume) file. I have no .wrl or .stp file activate option. Different User Interface on different OS? I am on MacOS. Perhaps I am missing something? A clarification would be helpful. Thank you!