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If you click on the link for the mac downloader, it only re-loads the page, doesn't open the downloader or start downloading process.
Maybe it helps to know that the only Starcraft data I have on my laptop is Starcraft 1 and Brood wars. So I have nothing from Starcraft II on my laptop.
 
Hmm. What browser are you using? Try Safari, if you're using something else.

To be a little more specific, when you click the download link it reverifies that your Battle.net account has access to SC2 before sending you the downloader (so that you can't just copy the link and give it to somebody without beta access). It's possible that your browser or security settings are getting in the way.
 
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