Existing users, 
"The Unarchiver" should be able to do most of what you need, but if you really need Stuffit Expander, here's a link to the current direct download (no email address required).
http://tinyurl.com/4aow4b
StuffIt Expander
expands downloaded file archives
Version: 13.0.2
Download
Feedback Type: Commentary
Contributed by: pg99--2008 Monday, November 02 2009 @ 10:30 AM PST
Product Platform: MacOSX
Used Product For: Over One Year
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