You need to provide more information on the operating system version you're running the SEP2 under. If it worked then DXO would advertise it accordingly. I'm not sure if this will work with other programs than Lightroom/Photoshop. I’d say DOX is trying to make their version still worth while as a plug-in.

DOX v2 introduces film sims in SEP that the original NIK and free google versions didn’t have at the that time. Plus there is a try & buy trail offer right now. It is still less expensive than the original suite with the 30% offer on the table right now.

Working with raw files nondestructively is a plus to me. In fact, this will work with any photo editor, including Photoshop, and including programs which can launch external editors, such as Capture One, since the Nik plug-ins can also operate as standalone programs.” The multipage TIFF format does produce quite large files, but it does allow re-editing within the Nik plug-ins, something never before possible. “The upshot is a world first – a non destructive plug-in filter workflow from within Lightroom. This might be something to consider withDOX V3:

Dxo photolab 3 nik collection