Some publishers include a free, digital calendar or desktop wallpaper download with the purchase of a calendar. Typically information can be found at the front of page-a-day desk calendars or on the back cover of wall calendars. Usually the publishers has a unique code for each download.  

If you have further questions or need assistance, contacting the publisher of the calendar is recommended.  If the calendar is from Lang Companies, you can find further instructions on downloading wallpaper by clicking here.