The Downbeat.zip file you have requested: Maps Levels Missions / Multiplayer / 3 Player / Downbeat - 377.32kb is not available. Perhaps try browsing all files for the game C&C3: Tiberium Wars and upload any files you want to share or are missing. This is the only information we could locate:
A 3-Player Command and Conquer 3 map from PomFrit. Only one tiberium field for all 3 players and there are some tiberium spikes to capture though.