Norton File Insight not showing file source of download

Normally in the past, each time I would download a Firefox installation file from Mozilla, I would use Norton File Insight to check the file Details, Activity, Origin, Rating, etc. Under “Origin” it always showed detailed location source info from Mozilla where it came. When I download Firefox 36 from the Mozilla website, however, and run Norton File Insight it says “Downloaded from Unknown.” Any thoughts on why it is not showing the URL server source for that program?

Thanks.