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1. What is with the "locked to license" versions of add-ons and other content?  Is this to prevent warez distribution?  Am I supposed to install it to my main Vue runtime, or can I install it in an external Vue runtime?

The license number of your copy of Vue (which Cornucopia3D got when you registered Vue) is incorporated into the content so that only your copy of Vue can load it so you can't give it away to other Vue users.

You can save some money this way.

OTOH, I wouldn't be surprised if there is an easy way around this limitation.

Tom