What exactly do I get when I buy a license for the software?
The purchase price allows you to use the software forever. You also get free upgrades to any minor releases of the version you have bought (e.g. v1.1 to v1.2). Upgrades to major releases (e.g. v1.x to v2.x) are not free, but will be available at a discounted price to you.
If this has not answered your question, open a support ticket to submit a question to our support staff.