Spectralayers path could not be found

Windows 10
I just purchased Nuendo 11, which came with Spectralayers One. Version 7.0.20. When I select an audio region and go to Extensions, I see Spectralayers, but when I click on it I get the error message “SpectraLayers path could not be found.”
Spectralayers standalone launches fine, and is completely useable. I just can’t launch it within Nuendo. I have tried uninstalling and reinstalling Spectralayers, but I still have the same result.
Can anyone tell me what I need to do to get it working inside Nuendo? Or does Spectralayers One only work as a standalone?
Thanks in advance.
By the way, the file “Spectralayers.vst3” is correctly inside the Program Files/Common Files/ VST3 folder.