There are several benefits to buying a 3-year license for Autodesk software, rather than an annual license:

1. Cost savings: A 3-year license can offer a cost savings over an annual license, especially if you opt for a multi-year contract upfront.
2. Budgeting: A 3-year license provides greater stability and predictability in your budget, as you know the cost for the next three years. On top of that, you save money by missing any price increases for the 3 years that you've already paid for.
3. Access to the latest software: With a 3-year license, you have access to the latest version of the Autodesk software for the entire duration of your license.
4. Technical support: A 3-year license usually comes with technical support for the entire duration of the license, which can be a valuable resource when you need help with the software.
5. Product upgrades: You can receive product upgrades, updates and new features during the entire duration of the 3-year license.

Overall, a 3-year license for Autodesk software can provide long-term cost savings, stable budgeting, and access to the latest software and support, making it a convenient and cost-effective option for businesses and individuals who use Autodesk products regularly.