First and foremost, anyone working with previous builds of 6.0 should download again (using the link previously supplied), remove the program and reinstall. This is necessary because the updater can't update itself while it is running.
Previously you optionally turned off CAD engines and pressed start and waited for feedback and results.
Now you get some feedback as soon as the dialog appears. It pre-fetches the index and shows you the files that will be updated, and those that won't. A file might be marked for skipping because it's all ready up to date or the updater has determined you don't have a particular CAD engine installed. Now you don't even have to think about CAD engines installed, the updater handles it for you.
Lastly, this update should let us move forward with quick updates through the entire life cycle of MapWorks, no more reinstalls necessary (we hope).