I have been playing quite a bit with the Updater Application Block as of late. I have heard a number of folks complain that it is hard to get working. Well I finally found one big problem with the Quickstarts. They use http to download updates in this case off my local IIS 6.0 install. The download was always failing with a message about a file not being found however if you looked at the directory all the files they were looking for were clearly there.
Well this is the second time in two weeks I have been bit by IIS 6.0 and the fact that if a MIME type isn't defined for an extension IIS 6.0 won't serve the file. It will instead return a 404. I had to add a mime type for the .PDB files that the manifest they setup attempts to download. Don't know if this was a step they forgot to tell you about or if their testing was all done on IIS 5.x. In any case there is your key from the wizard for this week.