Download vsto through clickonce install
I was getting this error while trying to deploy an excel-add-in through clickonce.
URLDownloadToCacheFile failed with HRESULT ‘-2146697210′
Error: An error occurred trying to download ‘http://###/ExcelAddIn.vsto’.
Simple fix - add .vsto –> application/x-ms-vsto to the MIME type in IIS.
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