[cefstat]

If you wipe the system then the time to set it up exactly like it was before is usually orders of magnitude larger than just waiting for the upgrade to move your brew installation out of /usr/local and back again. A better advice would be to just move the contents of your /usr/local to another directory and then move them back to /usr/local after the installation finishes.

I just ignored this and waited for the installer to do whatever it wanted. It took about 1 hour but everything went fine and I'm now up and running.