This code is (our best version) and is not for sale, there is no way to buy the full license because there is huge risk of piracy. You own your customization and code as long as you pay your yearly license.There is no way to get the license fully by paying more.
Microsoft, Apple, many antivirus companies work this way, and it is called software a service with OUR BIG PLUS that you can access the code. This help companies to stay safe and do get damaged by hackers and bad people.
I hope this is not something done against you but in order to survive in this dangerous market where there are lots of people wanting to make things for free out of the work of companies.
If you have some more questions on this ,please feel free to contact us on email@example.com , and we will be there always to help you.
Have a nice day.