Omeka on Dreamhost

I'm trying to install Omeka on Dreamhost using their one-click installer, but keep getting an error email that says:
We were unable to set up Omeka as requested at:
http://www.sfsma.org/omeka/

The problem was we couldn't extract the installation package from http://omeka.org/files/omeka-1.5.3.zip!
(Looked at george-read:/home/kpleonard/sfsma.org/omeka/app_468.zip)

Please correct this and go to our web panel and re-submit your
Omeka installation request.

What do I do?

Dreamhost has apparently fixed this, but they say it's a common error. Just so others know--