Same issue here.
– WP 4.9.1
– WP Google Maps 6.4.06
– Pro Add-on 5.60 with message:
“There is a new version of WP Google Maps – Pro Add-on available. View version 5.73 details or update now.”
A request on your site gives an automated downloadlink with wp-google-maps-pro5.60.zip
Can you send me the latest version?