I have an application that was made in 2009 and runs on .NET 3.5. It uses the 2009.3.1103.35 version of the Telerik.Web.UI.dll. The project relies heavily on that Rad user controls and AJAX managers, etc..
However, I have to upgrade the project to at least 4.0. The version of the installed Telerik does not support 4.0... So, I would also need to upgrade my version of Telerik, as well as buy a new license since the application was originally built by a third party.
I was curious as to what the process of upgrading from the 2009 version of Telerik to a more recent version would look like? Would it be simple or would it involve extensive work?