@lizz – I don’t know what Numbers is, but if you don’t have Microsoft Office Excel, you can download Open Office whose Calc program appears to work perfectly (I’ve just tried it!), it certainly loads the sheet and displays it in identical fashion to Excel. You can find the download here: http://download.openoffice.org/ It’s totally free, and works just as well as Microsoft Office.
I’ve not tried to use the sheet, maybe we could persuade @Annette to try it and make sure it works properly in Open Office Calc. How’re you fixed @Annette?