Elsewhere, I have read that you have to set the permissions for the POP (which is registered by Windows as a Camera) to be accessed by the HandyScan software. I don’t have Windows 10 (yet, it’s on its way), so I can’t tell you how to do that, but you might try searching with the terms “Windows camera”, or maybe just “camera”.
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I found it. Read this post: https://forum.revopoint3d.com/t/tips-remember-to-check-the-camera-permission-of-your-pc/2536
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Jeff