Hi Daniel,
that's really strange. I've just downloaded the archives in all image resolutions of the recent update without any problems. However, I will follow this problem but maybe you can help me with answering some questions: Did you got an error message or was the download successful? Which image resolution did you tried to download? If the download was ok could you open the archive? Maybe the download was stopped because of an interrupted connection so did you've tried to download the archive again? Finally, which browser do you use and do you have a program to secure the internet? It should be no trouble with such a program but maybe some are a little too secure.
I'm sure the problem will be solved quickly with your information.
Thanks,
Norman