Some download links expire in a fixed period of time (mostly 12 hours) or sometimes when IP address changes, downloads get interrupted. This Instructable, shows you as to how you can resume, such broken, timed out or interrupted downloads.
Step 1: Download Internet Download Manager
Link for a virus free, full and free version of IDM--- http://adf.ly/1YlZPb
What this video tutorial and follow the steps.