Do not purchase
Secondly, even if you do manage to make it install, it won't work because it does not give you anywhere to add the Google Maps API key that Google now requires.
Thirdly, the developer has unfortunately not responded to any of the Support requests in the past year.
Time for this to be pulled from the marketplace I reckon. (I didn't ask for a refund because in the end I did make it work by editing its files.)