Plug-in not visible in W7

Hi there!
I have downloaded great frequency monitor from Voxengo called SPAN.
It works great in Cubase, but there is no way (for me at least) to see it in Wavelab7.
I downloaded all updates etc. I placed .dll of that plug-in everywhere - I mean - everywhere.
Anybody has any idea why I don’t see it? Is it because Wavelab is blocking it for some reason?