Occasionally we will update a product to fix a problem or we will add a new feature. For all minor releases - you can simply download the latest version of your software, uninstall the existing copy and then install the new version. You should not need to reenter the unlock key and there is no cost for the update.
TALtech may charge an upgrade fee for major upgrades. Once you've paid the upgrade fee you are entitled to free minor upgrades for that release stream. For example, if you pay the upgrade fee for B-Coder 4.0 (from B-Coder 3.x), you will be entitled to all minor upgrades in the 4.x release stream.