I'll ask if my friend upgraded or not.I can confirm that Cisco VPN Client 4.9.01 (0080) works with Leopard. Re-install the client if you're doing an upgrade.
The Archive and Install will remove some of Cisco's files, so you'll need to reinstall Cisco after you do the install.
Then you aren't using the latest version like I posted above from MacUpdate. Most universities won't post Cisco VPN client updates for months after they actually come out.
Would it be safe for me to download 0080 or would that mess up my connection to the school's supportd 0030 version?
I went from 0030 to 0080 and I can still connect to my office with it. I'm pretty sure you won't lose your connectivity.
The weird looking symbols and letters are the contents of the DMG/ZIP/whatever you're downloading. Your browser is treating it as an enormous text file.Thanks. I had to have my Resnet school office activate my VPN through passwords and whatnot so if I downloaded 0080 I would probably have to go to them to activate it.
EDIT: I tried to download 0080 from that link provided by Sbrocket and when I click to download it brings me to a never-ending loading page filled with weird symbols and letters. No download occurs. Has it been disabled?
You'll need the very latest version of the Cisco VPN client for it to work with Leopard, available here if your company or university hasn't posted it yet:
http://www.macupdate.com/info.php/id/10317/cisco-vpn-client
Re-install the client if you're doing an upgrade.