This is from the Download page (
http://www.thetournamentdirector.net/download.html):
If you have version 2 already installed, do not uninstall it. Simply install the new version. The evaluation period will not be affected, nor will your license key status be affected if you are a registered user.
If you do uninstall the software first, your registration information will be removed and you will need to enter it again after installing the new version. Installing the latest version will not affect your database, preferences, or saved tournaments or templates. The new version
will overwrite templates that are included with the software, so if you've modified any of the included templates, you might want to back those up before installing the newest version.
Every new version is compatible with tournaments saved with previous versions. So version 2.2.2 will load 2.2, 2.1, 2.0, and even 1.3 tournaments.
If you're worried about upgrading, make a backup first. Just copy the folder in which you installed the Tournament Director (usually C:\Program Files\The Tournament Director 2) to somewhere else on your hard drive. If something does go wrong, you can always just put the copy back.