The latest version for each Mac platform is as follows:[1] StuffIt has been a target of criticism and dissatisfaction from Mac users in the past as the file format changes frequently, notably during the introduction of StuffIt version 5.0.

Expander 5.0 contained many bugs, and its file format was not readable by the earlier version 4.5, leaving Mac users of the time without a viable compression utility.

The previous stand-alone version able to decompress .sit and other classic Mac OS-specific archives was 7.02, distributed with StuffIt v7.0.x for Windows.

From versions 7.5.x to 11 the Expander capabilities were actually performed by the StuffIt Standard Edition, that allowed decompression even after the end of the trial period.

[4] There is also a command line DOS application called UNSTUFF v1.1 that allows decompression of .sit files.