Good trick! Renaming is always a good practice.

We do need the site contact in order to do site maintenance/rollbacks, but I think a rollback is a step in the wrong direction. I think you may have seen the ticket reply by now from the site contact.

In any case, we can try a rollback and see what happens, but if the installer conks out, you really should upgrade the script. Rolling back only puts you back at step "A."

You need to run the latest version to avoid hacks. All scripts are like an OS for your site. You would not run an outdated version of windows would you? Same goes for your site. If your software is old and moldy, so will be your site.