You start the Autodesk product and choose the Register and Activate option.
The Product Activation wizard launches but displays only two radio buttons with no associated text descriptions and there is no Next or Cancel buttons to allow you to proceed with the activation or cancel it.
There is no workaround for instance to IE9, the only solution is to roll back to IE8 to be able to activate the product.
Thanks to the M2 Technologies Inc Team (Tim Shaul, Mark Adams, Andrew Carlson, Thayne Wickam) for sharing this tip.
Thanks to Alison Gangler & Timmy De Austria for confirming this tip works in some customer cases.