I purchased the Gamersgate version of the expansion because it explicitly stated that it supported retail and online versions.
I have the Impulse version of Divinity 2 installed, and when trying to install the GamersGate expansion, it says "previous version of Divinity 2 not found" and aborts the installer.
What is up with that? How do I get this "all online versions" expansion I purchased to work with my online purchased Divinity 2?