I'd search your C drive for "nebula" and see where the DLL is.
Usually it installs in usual VSTPlugins under the folder "Acustica" but I think the "nebula" search will turn it up, and go from there.
Unfortunately i have to get to bed, but will check back and see what's what.
To my ears, the free libraries are very useful, and sound great. Even the compressors, man they bring some spank into the mix.
I'm a madman with the makeup gain control though
Oh, and there's more free libraries here:
Home :: nebula-programs.com