Big Huge Games has updated an existing patch for their world-bending RTS Rise of Nations because some people were having difficulty getting it to work. In their words, the new 8.7MB patch "will now install correctly". You can also get the patch by running the game, selecting "Multiplayer Game" and then choosing "GameSpy Internet Matchmaking", after which an automatic update should kick in.
The patch itself seems to be geared towards shoring up the multiplayer side of the game; reducing lag, making it easier to host games behind NAT, and adding another layer of cheat protection amongst other things. A full list of changes (including those from the original patch) can be found here.