FYI if you install the demo it never completely uninstalls... The registration information is still on the machine and you never get a registration pop up after installing the legit version. You need to trick it into opening up the registration window where you enter the voucher. To do this go to the HELP menu->registration information. Edit the serial by deleting a character and entering something else. This breaks the registration and then the window will pop up on next launch.
There is probably an easier way... this just happened to be the way I did it.
If you got an e-mail saying that the code was previously used, then I would recommend waiting for the UM and/or netfabb team to respond. Its an automated system, and only they can reset the key. You got a key for 1 machine, and after its use you cant install it on another machine anymore.
EDIT: I think they should recommend to de-install the demo version of netfabb first BEFORE installing it with a new key.
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