Once this was identified (by date on filezilla), and deleted; then the zip installation method worked instantly.
This plugin is loaded with features, beyond my needs, so I selected "1x" for the "Google Api version". I left the "key" and "multi key" fields blank.
Set the coordinates to your own, edit the "on-page" code, enable the plugin, and off you go.
I wouldn't have found the issue, without Mike's intervention - every so often, we find help from a stranger thousands of miles away and it restores our faith in humanity.
Thank you very much,
For the Google API version use 3.x that is for the latest version of Google Maps API and this version does not require a key.
Google Maps API Version 1 does not exists.