Checksums are used to verify a file you have on your computer is identical to the one on the server. Invalid checksum may indicate a corrupt download, or in much less common cases a file has been tampered with. Try another download.
Hi.. I know this conversation closed many months ago but I am having the same problem. I have just turned on one of my Macbooks and it indicated via the MacStore that I needed the recent update of IOSX software. Currently I am running 10.8.2... and it showed that I needed the new update of 10.8.3
I clicked on the download button and after download it came back with a message to say the file had been corrupted during download. I tried to download it again via the App Store but it then said that there are no current updates or all updates are current. I checked to make sure that the existing software had not updated and it had not. So I went to the Apple webpage where you are able to download files directly from the site. http://support.apple.com/downloads/
I then tried to download the 10.8.3 combo software... After about 35 mins I tried to install it from the Download file
After validating the file which is normal.. It cam back with an error - "Invalid Checksum" So I deleted the file from downloads and tried again.... Same thing...
I then tried to download the smaller update file (the one below in the image) - Less time to download but came back with the same error.
So in short I am unable to download this update... I am getting the same error message "Invalid Checksum" when I use either the AppStore or the main Apple software update page on the web..
Anyone suggest anything? I have tried to download this a couple of times now and am getting the same results.
Appreciate any help or advise.