4.5 for System 6+ (compatible with all 68k processors).The latest version for each Mac platform is as follows: Prior to 2011, a Linux version had also been available for download. It runs on the classic Mac OS, macOS, and Microsoft Windows. StuffIt Expander is a proprietary, freeware, closed source, decompression software utility developed by Allume Systems (a subsidiary of Smith Micro Software formerly known as Aladdin Systems).
