Thank you for contacting us.
From your post it seems that you have updated from 2011.1 11.419 to 2011.2 11.831, but for some reason the project is looking for version 2011.2.11.712. May be there was an incomplete update to 2011.2.11.712 before trying to update to the latest version.
As quickest solution I would advise you to remove all the Telerik references and then run the convert wizard.
I hope this helps. Please, do not hesitate to write us back if you need any further assistance.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>