Hello,
The latest Telerik UI for ASP.NET AJAX version is Q2 2015 SP2 (2015.2 826).
Note that since you are using a Classic version of our controls, migrating to the AJAX version would require some additional efforts. You may check the following help article for reference -
Migrating From RadTabStrip Classic to RadTabStrip for ASP.NET Ajax. In addition, you may need to perform migration for other controls as well, as described in similar help articles accordingly.
And as a side note I would like to mention that Classic controls versions are no longer supported as pointed in the
Telerik Support Lifecycle Policy.
Regards,
Dimitar
Telerik
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