A license is valid for Sublime Text 3, and includes all point updates, as well as access to prior versions (e.g., Sublime Text 2). Future major versions, such as Sublime Text 4, will be a paid upgrade.
Okay, thanks. So this means that I can keep using an old version? If so, that's great, but this quote came from the Sublime Text Sales Department when I emailed them, so could you further clarify? They said:
However, when version 4 is released you will be required to upgrade to continue using, so you cannot skip a step to save money.