Hello Frank,
As Matt said since 2008, there are too much improvements/changes in RadControls, so that it is difficult to list them all. However, you can have a look at the
release history of the controls which provide a detailed information on the matter.
We highly recommend to always use the latest version of RadControls (currently this is version 2013.2.611). Regarding the version of .NET, currently we support .NET 3.5/4.0/4.5, depending on the operation system. For a detailed information, please refer to
Supported Server-Side Frameworks article.
Regarding the issues that may arise after the upgrade, you can make a test with our trial version. Please feel free open a support ticket (during the trial period) or a forum thread, in case any questions related to RadControls occurs.
You can also find interesting our
online demos and
documentation.
Regards,
Danail Vasilev
Telerik
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