It's not possible to buy the application because the official website doesn't list the software anymore. I've used the link from the application's page here at Software Informer and although I've reached the correct link, there is another product listed on the website that has no connection with EasyDesk HelpDesk.
You will have to choose something else because this application appears to be discontinued.
It's also impossible to contact the developers since they don't have a way posted on the website to do so.
