I recently downloaded the R and R mod and can't figure out how to make it work. I think the tech trees are altered in the Conquest scenarios, but nothing else is changed. The quick start, new game, and multiplayer (hotseat) games all look the same as before.

go to civ-content and load up the rise and rule scenario. from there, you setup a regular random map. the mod isn't a specific scenario map, it's new rules for the regular game. the first sign that it's working is that there should be a load of different civ's to choose from

most mods are loaded from civ-content on the main menu. this is useful as it leaves the core game files untouched, so you don't have to re-install and fiddle eery time you want to play vanilla civ

Thanks... now I've run into another problem... Apparently the files are missing for the Tiger II and every time I try to build a tank the game crashes. Any idea where I could find the files to download?

You can try checking in the thread that the creator of the mod has in the Creation & Customization (http://forums.civfanatics.com/forumdisplay.php?f=46) forum.

the RAR folder needs to go into the scenarios folder of conquests. but the download is an automatic installer, so there should be any problems =S