Are you on subscription? We just recieved a pampflet from Autodesk with a bunch of info on the subscription plan, and one of the paragraphs stated this:
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"Only for Autodesk Subscription customers: In respnse to customer feedback and the need for design project flexibility, you have the right to use previous versions of licensed Autodesk software. Additionally, Subscription customers who add licenses to their Subscription contract can obtain additional activation codes for any release of a previous version the customer legally owns, up to the maximum number of seats currently under Subscription."
Message was edited by: Troy Grose