How to degrade to Zotero 8(now 9)? can't find the package

I upgrade the Zotero to 9 without considering the consequence, which caused the failure of plugins. I try to degrade, but I can't find the Zotero 8 installation package. Any information helpful, thanks!
https://s3.amazonaws.com/zotero.org/images/forums/u14025418/csbgvx4etloob7b2eqfl.png
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