Telerik AppBuilder is a cloud base service, so you're always using the latest version. If you rely on the AppBuilder Windows Client or Visual Studio extension for AppBuilder, you would be notified whenever there are new versions, so that you are able to update the Windows Client/VS extension respectively. You can then review the release notes from our documentation here
As for Kendo UI:
You can follow the release history on the relevant pages for each Kendo UI product on our site (here is the page for Kendo UI Complete
). We also plan to introduce RSS feeds for our release notes in the near future, which will help you get automated updates for new releases when you subscribe to these feeds.
Check out the new Telerik Platform - the only modular platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native apps. Register for the free online keynote and webinar to learn more about the Platform on Wednesday, February 12, 2014 at 11:00 a.m. ET (8:00 a.m. PT).