downloading

I have the most basic of problems - getting started. I've never had such trouble downloading a program before and am feeling a bit helpless and frustrated - with all the information out here, no one appears to have any issue so basic!

I just downloaded Zotero onto my MAC Mini (3.0 for safari). I did what I always do when downloading program for a MAC - just slide the Zotero icon into the "move here to install" (applications) folder. But, when I click on Zotero, it fails to start - I get an error message. For what it's worth, here's the message:


Process: zotero-bin [709]
Path: /Volumes/Zotero/Zotero.app/Contents/MacOS/zotero-bin
Identifier: zotero-bin
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: bash [702]

Interval Since Last Report: 868 sec
Crashes Since Last Report: 2
Per-App Interval Since Last Report: 0 sec
Per-App Crashes Since Last Report: 2

Date/Time: 2012-12-31 12:41:27.811 -0500
OS Version: Mac OS X 10.5.8 (9L31a)
Report Version: 6
Anonymous UUID: 95F02189-7E7E-4D65-A88A-4889109EDA90

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
unknown required load command 0x80000022

Can anyone help!
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