Hi, I have a weird problem with software update. When I try to use Software Update it downloads the file but will not open, and shows me the error message, "Update can't be installed - Software Update could not expand the package correctly.". This happened the first time a week ago and I thought was an isolated event, but it is happening again, so obviously there is a problem with Software Update. If I download it from Apple through Safari it works. Does anyone have a solution or fix? Thanks!