Launch Logic and go to Logic >Â Preferences >Â Audio Units Manager.
You can click on the "Manufacturer" tab to order them by Manufacturers. Do you see the Michael Norris plugins in there?
Are the plugins validated? If they're not validated, select them and click on "Reset & Rescan selection".
If you don't see them in the Audio Units Manager window, quit Logic and double check that all SoundMagic .component files are located inside Hard Drive >Â Library > Audio > Plug-Ins >Â Components and restart Logic.
(Place them directly in the Components folder... don't place them inside the SoundMagic Spectral Plug-ins folder).
Let me know how it goes!