Earlier versions can be download from the main site:
http://www.thetournamentdirector.net/downloadVersion2.htmlJust install whichever version you want. Note that installing a
newer version should work fine because the application is backwards-compatible. Newer versions can read files from any previous version. But it's not forwards-compatible. Older versions cannot necessarily read files from newer versions. So if you go from 3.4.2 to 3.3, you may not be able to load files saved with 3.4.2.
As always, take a backup first.