Try version 5.5. I've had very good results with that.

... I actually wonder how the Mac world embraced StuffIt and didn't get rid of it till Apple forced .zip upon is. StuffIt really is bad.

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Amen! You'd think Apple would have seen the opportunity and built some file decompression into MacOS at some point, especially since Stuffit was so bad. Since the Mac platform was based on ease of use, getting rid of Stuffit would have been a no brainer.