Virtual Box and single user install I recently uninstalled a VirtualBox installation that was made available to all users using the provided tool. I went to re-install for a single user, but it will only let me install for all users, not single user or specific location. How can I resolve this problem?

I'm using a 2013 MacBook Pro with MacOS Sierra
You can't, I'm afraid. I filed a bug about this years ago, and it was closed as wontfix.