How can I troubleshoot this?
The error says something like: The downloaded update is corrupted, try again.
Same thing here:
The problem seems to have been corrected.
Update successful today.
yes, the problem arised around 10.5., influenced both Linux and Mac, and its cause is investigated right now. On MacOS X, those “corrupted downloads” are kept aside, so we’ll know more when some Mac users that reported the same problem submit their data.
regards,
pc