I think you need to provide more context around your question.
I assume that you're reporting "number of clicks on a download link" from Adobe Analytics, but "number of downloads from the link" from another reporting tool, maybe one provided by your content management system.
As the label implies, "number of clicks on a download link" is the number of times that a link was clicked in order for the download to occur. On the other hand, "number of downloads from the link" could also count the number of times that a download link was opened directly, e.g. the user knows the link and opens it in his browser without needing to click anything in your web page.
If my assumption above is incorrect, then please provide more background information about your problem.
