Here are instructions for the future:
1. Deactivate the plugin. Use C-Panel File Manager. Zip up the plugin. Name it with the date at the end. Leave it on the site. Upgrade the new plugin. It fails and doesn’t work. What now?
Deactivate the new plugin. Delete it. Un-compress the old plugin from the zip file. Go to the backend of WordPress and activate the old plugin. You’re back in business with ANY plugin this way. And you won’t have to ever ask anyone to “roll back” a version.