Hi Kevin,
You can get to the location beyond the Roon.app folder by showing the package content in the Finder:
To do so: Right click on the “Roon.app” and click “Show package content”
Then browse further to the files, that are shown to be blocked by Norton Security.
When you add an exception in Norton Security, simply drag&drop the file from the finder window into the file-browser-window of Norton (where you could only select the Roon.app, before).,
Another way to navigate within Norton Security beyond Roon.app could be pressing CMD+Shift+“G” (when in Application folder) and enter “Roon.app/Contents”
If there is more than one file blocked, like RAATServer (that @andybob mentioned in his post), unblock the other files, too.
I can’t test it here as I am not using Norton. Hope this works for you.