Yeah, I have the same issue. Under Properties, there is no DLC tab to download the tools. But -- I went to Tools and downloaded the Divinity Engine 2 and started it up and it worked.

The problem I have now is that the Engine keeps crashing -- usually when I load resources when trying to make something new. Perhaps this is because I didn't install it as directed through the DLC tab.

Hoping this gets fixed and the Engine doesn't keep crashing on me.