The brushes are hosted on FileFactory (for free), the downside is that it takes a minute or so to actually download. But, this should help make your downloading process run smoother:
1.) Click on the link under the image of the brush set.
2.) After you click on the links you will see that it has the title of the .zip file in red at the top, which seems easy enough. But, then you will have to scroll down past the giant advertisement and click on the "DOWNLOAD NOW with FileFactory Basic" button.
3.) After you click on the "DOWNLOAD NOW with FileFactory Basic" button it should say "Your download link is below" at the top of the page (just under the title of the zip). The download is not immediate so you will have to wait for a minute or so (you will see a timer counting down at the bottom of the page). After the timer runs out you should be able to just click on the "Download with FileFactory Basic" and it should start downloading.