If your specific product is not listed above, you can locate your key through these official methods:
Use the official Autodesk Product Key Lookup Tool to select your specific version and product. product-keys-for-autodesk-2011-kuyhaa
Log in to your Autodesk Account to view license details and serial numbers for your subscriptions. If your specific product is not listed above,
Check for a MID.txt file in the setup folder of your installation media. The first five characters of the part number listed in this file typically serve as the product key. The first five characters of the part number
As of current policy, Autodesk generally provides official support only for the current version and up to five versions back. Legacy versions like 2011 may no longer be eligible for standard technical support or new activations. Look up product keys - Autodesk