Hi @beatrixwillius, unfortunately we're still unable to reproduce your issue after trying on our side.
The macOS VMs lead developer mentions that when you stop the VM, you also need to quit the Redmine VM app completely (if not, it will use the in-memory data).
If we don't close the Redmine VM app, we find your issue, but once we stop the VM, close the app, replace the file, and then open and start it again, it works perfectly.
After you replace the "metadata.json" file, you can open the Redmine VM app again and it should work.
If you're still finding issues, could you confirm that your issue consists in the Redmine VM showing a dialog with an error message "cannot calculate MAC address" right after clicking on the start button? Thanks!