The DSM-V (and other previous editions of the DSM) can be found in the DSM Library database.
On the Library homepage, select the All Databases link and scroll down until DSM Library appears.
Scroll down the alphabetized list until you see the database listed, and click on the icon:
The DSM Library will load in a new window or browser tab.
In the new window, look just below the search box on the right hand side for a link labeled DSM Legacy. The DSM IV will be one of the editions listed. It is a downloadable, single PDF file.