Without it at least one quest is broken. Meaning you can't even access it.
To fix it you can either install this mod, or follow the instructions to fix it here:
However the mod adds more stuff to the game than this.
To fix it you can either install this mod, or follow the instructions to fix it here:
Tenochtitlan Quest
The Tenochtitlan quest begins automatically once you set foot on 'The Shores of Mosquito', which is north of Santa Catalina and south of Caratasca Lagoon. As soon as you moor your vessel, you will be approached by a man named Silvio Ricci. If you are playing on Vanilla Age of Pirates 2, you may...
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