The product key differs depending on how the software was purchased (individually or as part of a suite): Cadac Group Product Version Product Key Autodesk 3ds Max 2021 3ds Max with Softimage 2021 3ds Max Entertainment Creation Suite Premium 2021 3. How to Enter Your Serial Number
Common fixes:
Before I provide any information, I want to emphasize that using pirated software or sharing serial numbers and product keys without a valid license is against Autodesk's terms of service and may be illegal.
