The version 1.3 trainer was created by a dedicated community member (known as on forums) and first shared in early 2011. It quickly became a favourite among Anno 1404 fans because it was:
The trainer will not work with the "Venice" expansion unless the executable version matches exactly. The 1.03.3650.15 trainer is primarily for the base game + Venice (as a combined exe). If you play Venice standalone, verify the version number again.