Stuck on "Check for Updates"

[Split from Now available: Zotero 7]

I tried to update Zotero 6 directly to version 7. I clicked "Help" in Zotero 6 and selected "Check for Updates," but it shows this page and doesn't load to the final step. Could you please help me understand why this is happening? Thank you!
https://s3.amazonaws.com/zotero.org/images/forums/u14928129/hrdxlip4p6r2fulz8zbn.png
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