Moved to own topic from this thread:
Solved! Go to Solution.
The same ways are possible that you also use on a real one:
if you don't have internet access, you can use the offline import button which can be found on "Node-RED Hamburger Menu -> Manage Palette -> Import Library" using the ready-to-run package of the ctrlX Nodes node-red-contrib-ctrlx-automation-1.8.8.tgz n attachment. Please let me know after successfull download (please remove the .zip extension) i, so I can delete this from the chat again. Thank you.