Make certain after the OS install to the PC that you follow the directions EXACTLY as posted, and in order as posted.
Make sure you delete the vendor.xml file.
The DM version and build# and the OS version and build# in now way correlate. How do I upgrade the OS on my BlackBerry? - BlackBerryFAQ
Good luck... and, always best to just post questions like this IN the thread from which you downloaded, keeps the forums nice and tidy