Hi Warren,
Make sure you first uninstall the previous version of the Blackmagic drivers and then install 9.7.7. Also make sure to restart your computer.
If CC still fails to see the plugins, verify that they are in the correct directory. They should be located here:
/Library/Application Support/Adobe/Common/Plug-ins/7.0
Lastly, you can try holding down the Shift key on launch. This will rescan the plugins.
Let me know if this doesn’t resolve your issue.
Best,
Peter Garaway
Adobe
Premiere Pro