Hi Piet Koole,
Can you try to run your Visual Studio as administrator from the right click context menu. I believe this should fix the problem. If not could you please send me the error/text you are getting.
All the best,
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.