I messed around with OS X today and could only update it as far as 10.04.
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*I wrote the following in another thread here

I can't even download Limewire for OS X because I'm stuck on 10.04 and for some strange reason I can't unstuff .dmg files. I can't even download Stuffit Expander for OS X because I CAN'T UNSTUFF THE FILE! How crazy is that? I've tried to download OS 10.1.5 and higher but it does me no good because I can't launch the files (.dmg).

Anybody have a solution for that?