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If I understand your request correctly it seems to me that you want to allow your users to download a file on your form at which point they could the fill it in or whatever and re-upload it on the same form they got it form? Or?
The only way I can think of at the moment based on your current description would be for you to create a form that users fill in at which point after submitting it they would be able to click a link to download a file and then resubmit to send back to you on a second form.
However, I'm not sure if I understood you correctly or not. If the above is correct let us know and we can help you create that otherwise please describe to us with an example of this sort workflow you desire and we can then help you with this request better.