I found out that if one backs out of the new vRealize Automation 7, vRA, Installation Wizard, it actually reverts to the manual installation. That's not always the desired result when really one may just want to start over.
The trick to getting the wizard back when navigating to the VAMI (port 5480) is to re-enable the wizard. To do that, one has to log into the vRA console (root / pwd) to execute these commands.
1. cd to /usr/sbin
2. run 'vcac-vami installation-wizard activate'
3. confirm with 'yes'
That's it.