Unlike other WaterDataProviders, the one for Stylized Water 2 is included with the Stylized Water 2 asset instead of DWP2.
Set up the scene as per quick start guide for flat water, minus FlatWaterDataProvider.
Go to Help → Stylized Water 2, and click the “Install integration” button. Wait until scripts have finished compiling.
Add StylizedWaterDataProvider to the object containing OceanRenderer script.