I cannot update the Lion O/S in my mid 2007 Macbook. After repeatedly trying to download the 2.06 GB of update data I get the following message: The update "Mac OS X Update Combined" can't be saved. The update could not be verified. It may have been corrupted during downloading. The update will be downloaded and checked again the next time that Software Update runs. I am using Airport Extreme and Airport Express on my wireless network and I have a good connection speed. I have been able to update the other items such as Garageband, iphoto, iweb etc. Kindly help me to update the operating system.