I too would like these added if possible.
Copy the files over as per the procedure. It will work, but the plugins are not enabled.
Do this next:
Then go into your Addon Browser, select “All” and browse down till you find the GLspectrum and Waveform visualisations, and enable them. This worked for me.
Sorry to be so vague, but I’m at work. When I get home I may dummy up a guide (with screenshots).