I installed the patch but now most of the games in the patch list are displaying a CRC mismatch. What is wrong?
Patch 1.02 introduced additional security measures, which will result in CRC mismatches if certain game files have been altered. These checks are still present in 1.03. If you (or a mod you installed) edited any of age3 game files (such as .con or .xml) you may now receive CRC mismatch error. Undo ANY changes made to your .xml game files game files in the installation folder; default c:\program files\age of empires 3\ and the problem should be fixed. If this does not work you may have to uninstall the game, remove the age3 folder from “My documents\my games” (make backups of any savegames, recordedgames, and screenshots)and reinstall the game and patch.