Error when importing Fmod in Unity 6000.0.34f1

When I import Fmod in the new Unity 6 version, I instantly errors like:

Assets\Plugins\FMOD\src\EventHandler.cs(2,19): error CS0234: The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

I uploaded a screenshot with the rest of the errors:

I tried installing from the asset store and from the official website, but I get the same errors.

How do I fix this? Is my Unity version too early? Do I have to install something? Thanks in advance.