After buying this software, a registration key will be sent to you through email to unlock the software. The software and the registration key are delivered electronically only. You will also get one year free major and minor upgrades. For example, you can get free upgrades to version 1.7.0, 1.8.0, 2.0.0 etc if they are released within one year after you bought our software. After one year, you can optionally renew your support for future upgrades for one more year at 40% of the then list price. You can continue to use your software without making this renewal, and you can renew at any point in time.
After buying upgrade, a new registration key will be sent to you through email to unlock the new version. You will get one year free major and minor upgrades. The 12-month period will start immediately from the time you renew. If you buy the upgrade before your license has expired, the days left in your old license will not be carried to the new one. So you do not need to upgrade immediately when the upgrade protection has expired. You can wait until next major or minor release is out. For example, version 1.7.0 was released on June 25, 2011. If your upgrade protection expires on or after that date, you can install 1.7.0 version for free. Since you can install 1.7.0, versions 1.7.x (1.7.1, 1.7.2...) will be free to you, you can wait until version 1.8.0 or higher is out before buying your upgrade.