Once your purchase is complete, go to your downloads page by clicking on "My Account" at the top of the store, and clicking downloads. You will be take n to the following page:
Click on the "downloads" link. You can always go back to your
downloads page by clicking on MY ACCOUNT at the top of the store.
Your downloads page will list everything you have purchased,
including the speaker, title, and file size (notice that videos are much
larger than audio). If you have many purchases, you may have to scroll
through multiple pages.
When you find the file you want to download, click on the button and your download should begin automatically. If your download doesn't
begin, or begins to play rather than download, you may have to right-click (if you are on a Mac hold the CTRL
key and click or do a two-finger click) on the icon and select "Save Link As..."