It's impossible to download or purchase the application since its official website is not working anymore. I have tried to access it, but the page simply refuses to load. This issue causes the impossibility to buy the application and you will have to wait until the site comes back up.
This is the website you have to visit: http://www.suremaps.com
The message on the website says: "We will be back soon". Check back later with the software an then you can find additional details about it.