Hello Hammond,
Apologies for the delayed response due to the weekend. Sorry for the inconvenience you are experiencing.
I've reviewed the backup, and it appears the issue isn't related to SP Page Builder. Your Joomla installation seems to be encountering problems. It's not adding new extensions and is displaying a "Fatal error" I've also found files in your site files that don't belong to a standard Joomla installation. Additionally, your database contains tables with two different prefixes, which is incorrect.
If you have a working backup that functioned correctly, please share it with me.
Best regards