If you want to use Maple on a computer at home, you can buy the student version of Maple from the SFU Microcomputer Store, or you can purchase it on-line directly from Maple's Web Site.
You can also order a free demo version of Maple directly from their their web site.
For information on how to download a Maple Worksheet, see the Math 251 FAQ: How do I Download a Maple Worksheed?