Use this forum for technical support and general questions related to GEO my WP plugin and its core add-ons only. For technical support and general questions related to any of the premium extensions please open a new premium support ticket.
No, this extension was developed by another developer and is no longer supported ( for the moment ). So it won’t work with GEO my WP 3.0+.
However, you can simply create a new ‘country’ custom taxonomy on your site and assign a country to each location that you create. Then you will be able to add this country taxonomy as a dropdown filter to the search form.