All active licenses have the ability to download Xenforo 2.1
You would just need to make sure your license is currently active to download updates. I believe it's $55 for 1 year of updates and support. So if your license is expired you just renew for a year of updates. If it is current and up to date you can download it.
Thank you. My current license is good for another month but I want to check out 2.10 on a new processor (Digital Ocean droplet) and keep my current system active until our add on selection and styling is complete.