Hi Margaret,
as we do not know what issue exactly you are facing let me just quickly say what worked for me (successfully tested it just now):
(1) I go to
https://portals.broadinstitute.org/cmap/ and log in (+ register first if applicable)
(2) I go to downloads (top right tab)
(3) I choose the .cel files arrow
(4) I click on any of the .zip 7 files and it asks me where to save them.
Does this work for you?
Best regards,
Maciej