The Vital AU fails the check that is performed by DP every time a new AU is added. “Problems were encountered. 1 AU not loaded.”
The VST version works in DP, so it’s not a critical issue for me.
What Mac OS? And DP version?
Oh, right, that info would help, wouldn’t it? 
Mac OS 10.14.6
DP 9.52
ummm strange… I happen to have have exact same OS and DP ver.
I only use AU and its there
What is your Primary External Plugin format? (in DP Preferences)
Thanks for checking it. I have the primary plugin format as AU.
I just did a rescan and now it’s working. Who knows what that could have been.
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I scared your system 
Have fun!
I tried editing to append “[SOLVED]” into my subject line. When I clicked the edit pencil it showed my edit history (i.e., I had edited the initial post once before). I don’t see how to edit it a 2nd time.
“We”, probably don’t have enough rights to mark a post as Solved…
We do, (as I have done it on another post), seems like the obstacle is that you an only edit a post one time (?)