Okay, I'm going to try again from scratch.
1. I'm going to copy the entire 4.7 version files from a backup.
2. I'm going to upload the latest verion build (5.61) on top of the existing 4.7 files.
Which version of the config file needs to be in the home dir, 4.7 or 5.61?
I will then try running update.php again...