Hi,
Not sure if I should start a new topic/thread but I ran into a similar problem while updating to the latest version (4.0.2 (Final 4.2.5309.330590)) from within the program. Previous version was 4.0.0 and that installed over version 3.5.11 (I think) without any hassles.
I've attached an image of the error message.
The update appears to have been successful though I haven't used it extensively.