To be honest, I don't know what VM -- I simply downloaded the only Drupal 8.5.3 version for MacOS from this page:
After mounting the .dmg, it comes up as a normal MacOS app bundle called Drupal.app, which runs Debian linux in a VM that doesn't really identify itself. To me it appears that bitnami has packaged this as some sort of bitnami VM, and not one that one can load into VMware or VirtualBox.
The options for downloads on the bitnami web site appear to have changed very recently. There is no module for Drupal 8, for example. And the docs for this kind of VM are very sparse on the bitnami site.
Thank you for responding!