You can get Stuffit Expander 3.5 & 4.0 from Macintroid's Tripod Website: http://macintroid.tripod.com/macintroid/id6.html They will run on System 6; but you did not mention what machine you have. Stuffit Expander 3.5 will work on a 68K Mac (Mac Plus, SE, Classic, etc.) Suffit Expander 4.0 will work on a 68K Mac with System 6, though a Mac II and beyond would be better.

Mac GUI has Stuffit Expander 4.0 for the download: http://macgui.com/downloads/?file_id=22845

On Jag's website, you can run Stuffit 5.x on System 7 on a 68K Mac though the installer wont let install it on System 7 - it wants System 7.1.1. Just install Stuffit 5.x into a machine with System 7.5 and then compress it into a floppy and copy to System 7.1 and expand it there. I've done this myself long ago so I know it works. See: http://www.jagshouse.com/stuffit.html

There is a note I seen while searching through the net; if you have and want more than 8megs of RAM, do not use the old Apple 32Bit Addressing Extension (I've rarely seen it used, how ever). Use Mode32 instead. Stuffit Expander crashes under Apple's 32Bit Addressing Extension.

If any of these links breaks the site's TOS, I hope the admins delete the links, not the post. Thanks.