jQuery UI zip file can't open in Windows7 -- it's empty!

jQuery UI zip file can't open in Windows7 -- it's empty!

I don't remember how many times I downloaded today jquery-ui-1.8.12.custom.zip each time with a different theme to find out a popup "file empty" under Win7.
Comparing a file jquery-ui-1.8.11.custom.zip downloaded a few days ago and today's file which is only 64KB, I can see the reason.
Any idea what's going on today with download?
thanks