In uSpace click on Your Stuff and select Documents from the drop menu to show a list of your uSpace documents.
Select the document you wish to download.
If the document you wish to download is a document which was created in uSpace, you will need to select View as PDF from the Actions menu on the right.
From the PDF view of the document you will see a blue options bar in the bottom right corner with a disk icon. Click on the disk icon to save your document. If you cannot see the blue menu bar you can bring it up by moving your cursor to the bottom right corner of the document window.
If the document you wish to download is one which has been uploaded into uSpace, then once you have selected a document, below the document view you will see options to View and Download your document. Select Download to save your document.