Learning to make extension and following the exemple Hello Cube, I was blocked on registration one my desktop, can you help me?
(1) Did you sign your extension via the Signing portal ?
(Only registered developers can use the portal.)
(2) If not, what is your Extensions Loading Policy ?
Window > Extension Manager > Settings (
at top right)
Choose the Approve or Unrestricted option and click the Confirm button.
Restart SketchUp to see if your extension loads.
Extension loading Policy was not confirmed and now it works! Thank you so much DanRathbun, I can continue to learn 
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