In the Harvard Geospatial Library, you can then click the + button underneath the shopping cart icon in the leftside panel for the map or data you would like to download. Then click on the "Cart" tab above the menu on the leftside panel. From there, you can press download in the menu on the leftside panel. It will ask you if you want to clip the download to the map extent. Then it will prompt you to enter an email address. Once you click download, you will see a circling set of dots in the lower right telling you the download is in process. Eventually, you should then get a pop-up alert that the download has been sent. If you do not then get an email within a reasonable amount of time, you should check your spam folder. Sometimes the emails will get filtered there.