You are adding a jQuery click event inside a FreeDownloadEventTracking event, which I presume doesn’t exist.
The page would need to trigger FreeDownloadEventTracking for your click event to be added to the download link.
I would suggest replacing FreeDownloadEventTracking with DOMContentLoaded so your click event is added to div.free-download a when the DOM is loaded. Then clicking the free download link will trigger gtag
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