You can see this information your account. Please check the attached screenshot - the latest version is marked in red box. There's also a link that can leads you to a page, showing list of all versions that are released together with their build numbers.
Let us know if you have any other questions.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items