Not a valid archive from "Build Your Download" at jQUery UI

Not a valid archive from "Build Your Download" at jQUery UI


Hi,
I am sorry to have to ask such a basic question, but I am having
trouble with the zip files I download from the "Build Your Download"
at jQuery UI - I always end up with an "invalid archive".
The only way I can get a valid archive is if I use the general link at
the top of the page "Quick downloads: Current (stable)", but then I am
loosing out on a lot of features and themeing.
What am I doing wrong, I can not imagine that the page should not
work; thanks for any assistance given.
Kind Regards
Hans P. Dramstad