Alex Pankratov :
Dec 21, 2018
There are two types of updates - milestone (feature) releases and maintenance (bugfix) releases. For example, release 79 is the former and releases 79.1, 79.8, etc. are the former.
Right now both types are included with a license, perpetually.
This will change shortly. Maintenance releases will remain perpetually free, but the access to milestones releases will be included for one year and require a fee to extend it for another year after that.
See here for details - https://bvckup2.com/wip/07062018