Installing, opening Omeka zip file

I apologize if this has been covered elsewhere (and just can't find it). I've installed MAMP on my Mac and downloaded LAMP as well as Omeka, per the instructions here:

But, I can't find the appropriate zip file to open for Omeka. I've searched in that file and simply cannot find a zip file. Can anyone help be get over this hurtle?

Many thanks in advance!

The file that you download from's Download page is the Omeka zip.