
Here is a Disk Copy 4.2 image of an original floppy disk distributed by Aladdin Systems (see screenshot). The disk contains DropStuff 4.0 installer, StuffIt Expander 4.01 and StuffIt Expander for Windows. Worth archiving an original disk I think.
StuffIt Expander runs on SSW 6.x and later. The DropStuff application requires SSW 7.0 or newer (gets "Requires Apple Events. Upgrade to Mac OS 7.0 or later" error alert). In SSW 6 you cannot drag an archive to the Expander icon to extract, you have to navigate to the archive via the Expander's "Open" file menu.