Can't install Zotfile

I have downloaded Zotfile and am attempting to install it - Tools | Addons | Plugins then the Cog then Install Add-on from File then select the file giving me a dialog with title Soiftware Installation, a warning about Malicious software, and Zotfile showing in a listview. Selecting it doesn't give any indication and clicking Install Now just closes the dialog without doing anything. Any clues?

Zotero 5.0.77, Windows 10.1909
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