To avoid misunderstood 
SE is working except it can’t be removed (grayed menue)
Pro is not working … since I’ve followed your hint.
I’ve insert SE → it works
I’ve inserted Pro → it works!
While Pro is up and running I’ve called “Check and repair configuration” and from this point Pro is working while opening from VST Cloud menue which is not working beforehand.
And yes SE / Pro is ticked.
Here’s a screenshot from the plugin manager BEFORE I followed your hint :
And here while pro is working (but not running) :
As you can see “E/A” and “Latenz” are filled out now.
I’ll now reboot my Mac to see if this situation is stable. I will respond soon.
UPDATE:
After rebooting my Mac VST Connect Pro is up and running when calling from VST Cloud menue.
This is great and I can start my experience
Thx for your hint, Michael!