InstaUp2Date error 404 on Airport Utility 552 update

I’m working with the 10.6.3 reference release disc and following the quick start instructions. When InstaUp2Date runs it can’t find the Airport Utility update, perhaps because Apple has now posted version 5.5.3 and it is looking for 5.5.2. Here is the actual error message:

Finding and validating the sources for 10.6_vanilla
Mac OS X 10.6.7 Combo Update – downloaded and verified 1007.1 Megabytes in 1 minute 53 seconds (9.0 Megabytes/sec)
Java For Mac OS X 10.6 Update 4 – downloaded and verified 74.8 Megabytes in 8 seconds (9.1 Megabytes/sec)
iTunes 10.2.2 – downloaded and verified 75.6 Megabytes in 12 seconds (6.3 Megabytes/sec)
AirPort Utility 5.5.2 – looking based on display nameTraceback (most recent call last):
File “./instadmg/AddOns/InstaUp2Date/instaUp2Date.py”, line 716, in
main()
File “./instadmg/AddOns/InstaUp2Date/instaUp2Date.py”, line 671, in main
thisController.findItems()
File “./instadmg/AddOns/InstaUp2Date/instaUp2Date.py”, line 330, in findItems
thisItem.findItem(progressReporter=progressReporter)
File “/Users/admin/instadmg/AddOns/InstaUp2Date/Resources/installerPackage.py”, line 158, in findItem
self.filePath = cacheController.findItem(self.source, self.checksumType, self.checksumValue, self.displayName, additionalSourceFolders, progressReporter)
File “/Users/admin/instadmg/AddOns/InstaUp2Date/Resources/cacheController.py”, line 307, in findItem
raise Exception(‘Got status code: %s while trying to connect to remote url: %s’ % (str(error.code), nameOrLocation))
Exception: Got status code: 404 while trying to connect to remote url: http://support.apple.com/downloads/DL955/en_US/AirPortUtility552.dmg