If you open TableNinja and an update is available there will be a pop-up at startup informing you of the update, and a "Download Now" button that will download the update. If you click "Close TableNinja" the program will close and will not update.
Once the update is downloaded, the installer will launch automatically. To install the update just follow the onscreen instructions. Your existing unlock code, saved configurations, and log file will not be affected by the update.
TableNinja will automatically launch after the installation process is complete.