The unrealtournament subreddit is your best bet. You can find links to download the game, get a cd key, and configure for the new master servers so you can fin

The unrealtournament subreddit is your best bet. You can find links to download the game, get a cd key, and configure for the new master servers so you can find servers online. Game tracker still lists this game, so you can check there to find the most popular servers which are still active and have players.