Use the official Autodesk Product Key Lookup Tool to select your specific version and product.
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. product-keys-for-autodesk-2011-kuyhaa
Log in to your Autodesk Account to view license details and serial numbers for your subscriptions. Use the official Autodesk Product Key Lookup Tool