OM in Mac Systems 1.13.6 seems to be non-working (see ticket #5607, comment 16).
Therefore, I tried to use Oracle's Virtual Box and the OM pre-built VM.
I did as follows:
- downloaded and installed VirtualBox 6.1.10 for Mac
- downloaded https://build.openmodelica.org/omc/buil … dev.02.vdi and put it into my desktop
- from within VirtualBox I tried do "Add" that VM, but the file appears greyed and therefore cannot be added as a VM.

What's my mistake? What should I do?
Thanks.