Honestly, you should buy the CD version from eBay which you are unlikely to find downloadable anywhere.
It has extra graphics and John Rhys Davies (actor from Lord of the Rings, Indiana Jones, Living Daylights) doing the narration and is well worth it.
The following guy is selling it for $14.99 which is good value.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=62053&item=8184821056&rd=1&ssPageName=WDVW