DEVONthink pro 3 not on the applications list

I paid a lot of money for a standard licence for DEVONthink pro 3 but there is no way of downloading it. It seems this application is not on offer, only paying for it is on offer. This is not fair, is it? There was also no way of merely upgrading from the version 2.11.3 bought from AppStore. I am not happy. Can anybody from DEVON technologies help me?