I just upgraded to the latest Telerik version. First of all, congratulations on a job well done on the MVC Project Upgrade Wizard! With version 2017.3.1026 it was unreliable, took hours to run, and generally locked up Visual Studio; the new version runs cleanly and quickly.
One comment: The popup dialogs for the Upgrade Wizard do not adapt to different screen resolutions. I see this where my primary display is high resolution (3840 x 2160) and the secondary is lower res (1920 x 1080). The effect is that the popup dialogs are cropped if Visual Studio is running on the secondary display: the message ("file xxx exists; do you want to overwrite?") appears, but the Yes/No buttons and "apply to all files" checkbox do not. The only actionable option is to kill the dialog, at which point the next one pops up. The only way I found to stop the Wizard is to kill Visual Studio through the Task Manager.
The Wizard works perfectly on the primary high-res display.