Limewire 4.12.8/Mac OSX/Downloading problem.

[vampirejam]

Sorry if the answer to my question is super obvious, I am horrible at computers.

I downloaded Limewire 4.12.8 about a year ago and it was installed to both my account flawlessly and my moms account on our Mac. My version wouldn't connect so i couldn't download. But it would on my mom's account and it worked fine.

I got frustrated and deleted my Limewire. Little did i know that it got deleted on my mom's account as well(im so dumb!).

And now im trying to download it again.
Once its done downloading, i try opening the LimeWireMac.bin and it creates a Limewire_Installer folder. I try opening that and the Classic Startup opens up with a message saying:
'Classic cannot find a Mac OS 9 system folder on the startup disk to us. You may need to install Mac OS 9.1 or later on your comp. To select a system folder on another volume, click Open Classic Preferences.'

I try opening it because im frustrated at this point, and yet another message appears:
'No Classic system folder. You dont have a version of Mac OS 9 installed that supports Classic. Install Mac OS 9.1 or later.'

Again, i apologize if this problem is really simple to fix, but computers really confuse me.

Thanks again for any that take time helping me!!