To save single documents select the desired document. On the information page of the document you can find a link to download the latest version of the document. After clicking on download you can select a folder on your hard drive to which the document will be saved.

In order to download all the documents of one folder, you must select the desired folder. On the main page you have the option to Download as zip-file. Clicking on this link will prompt the download dialog, asking you to select a folder on your hard drive to which the zip-file should be saved. You will receive a zip-file of the folder.