UpdateCitations (ZoteroScholarCitations) no longer working

I've been using the add-on ZoteroScholarCitations for a while, which writes into the Extra field the number of citations that a paper has, according to Google Scholar. This was done automatically upon saving a new paper to Zotero, and could also be used manually, by right-clicking on an existing paper and choosing UpdateCitations.

Recently, this addon (or something in Zotero allowing it) has stopped working. Can anyone suggest a way to get it back?

Thanks very much for any help. Am using Standalone 5.0.62
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