Most accounting software these days has moved to a subscription based service whereby you can use the program only as long as you pay the ongoing charge. Usually your data is then stored in the Cloud. On the plus side, this service includes software updates and telephone support.
With ABC you pay a one-off fee to use the software for as long as you like, and your accounts data is under your control on your own computers (you can backup to the Cloud if you wish). Telephone support and software updates are optional and you pay for those as you need.
Our Annual Support provides Telephone Help and software updates to incorporate new features and any legislation changes (think Brexit and Making Tax Digital for example). But even if you don't want full Support, we recommend you do at least Update your software a couple of times a year.