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Hi @Anonymous,
Thank you for posting your question here. In addition to @pendean's advice to use the "Find..." feature to locate all Autodesk registry keys on a machine, you could also refer to the instructions for performing a clean uninstall of all Autodesk programs. In the section titled "Delete remaining Autodesk product entries from the Windows registry", you'll see the registry locations listed.
You can determine the version number of an AutoCAD-based program by navigating to the C:\ProgramData\Autodesk\AutoCAD 20XX folder:
I can't speak to any of the products outside the AutoCAD-based programs, but there is likely to be a similar location in the folder structure of each product.
R20.1 = AutoCAD 2016
R20.0 = AutoCAD 2015
R19.1 = AutoCAD 2014
R19.0 = AutoCAD 2013
R18.2 = AutoCAD 2012
R18.1 = AutoCAD 2011
R18.0 = AutoCAD 2010
R17.2 = AutoCAD 2009
This reference came in handy, and you might find some additional useful information there for what you're trying to accomplish.

Victoria Studley
Principal Experience Designer - Fusion Configurations
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