to seek manual activation from Autodesk support, though success is not guaranteed for this retired version. Autodesk Community, Autodesk Forums, Autodesk Forum Activate & Register your Software - Pentagon Solutions
The activation code is required to ensure that the software is genuine and has been purchased from an authorized Autodesk reseller. The activation process involves verifying the product key, creating a unique system identifier, and generating an activation code that is specific to the user's system.
If you do not want to pay for a subscription, several free or low-cost computer-aided design (CAD) programs exist: