fail to install edge extension Zotero Connector
I use edge, and when I tried to install Zotero Connector in Microsoft store, it failed and showed "Download was not a valid extension or user script". But I can install any other edge extension.
We just upload a valid extension to the site, and it's checked by Microsoft before release. We have no control over it after that point. But there's no general problem with the download, so this is a local problem on your end.