When I try to download something, I get this error. If I click "send anyway", the page just reloads. I tried with other browser, but the page just refreshes instead of sending this error.
Edit: I only have the steam version so I can't play anyway. Is there a way to manually download mods? I just want the fan patch.

This fails, because the Steam version is not compatible with the old game which also means, that the required folders cannot be created and that the download of the desired AOM mod will fail.