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Hi,
you are in the wrong forum, this forum here handles questions about development on top of AutoCAD with .NET based code.
Instead you should ask in the forum about >>>installation and licensing<<<. (wait a little bit, maybe an admin moves this post).
>> Error message saying files are missing
Try to download with another browser, without download-manager or from a workstation with another account to internet (to prevent some proxy- or firewall issues).
Good luck, - alfred -