How to downgrade?

Hi,

I help a friend with some zotero import, then I turned on my stand alone zotero, and an update was proposed .... I did it, it crashed.... and then I was told this program is not compatible with you version of OSX
how to get an older vertion? or the source code to compile it by myself?
os: Mac OS X 10.5.8 (9L31a)
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