EDIT: Installed the patches using manual downloads. Seems to work fine! Thanks anyway!
Yeah, seems to work now. Turns out I may have just needed to run AoE3 vanilla as I hadn't played it in a while but im not sure anymore. Anyway, my only issue now is that the updater can't seem to connect to any of the file servers and download any of the updates. I've tried the main source and the alternate source and neither of them work. They just give me errors saying to try again?