zotero 4.0 does not start on macOSX 10.6.8

Hi, I have Zotero version 4.0 on macOSX 10.6.8, it was crashing so I tried to update it to 5.0, but my mac is tool old for that version, so I threw Zotero in the trash and download version 4.0 again. However it doesn't start anymore and I have no message. I tried to restart the computer but that doesn't work either. Can you please help me?
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