If you're planning on a major or minor upgrade, you'll need to get an updated license file from our sales team by emailing them at firstname.lastname@example.org.
A major upgrade is when the first digit of the version number is increased. For example, 9.1 to 10.0 would be a major upgrade.
A minor upgrade is when the second digit increases. For example, 10.0 to 10.1 would be a minor upgrade.
A patch upgrade doesn't need a license update, and those look like 10.1.5 to 10.1.6.