There’s a few ways to do this:
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Adding a download link to your Form’s Success Message: Upon completion of your form, users should see a message of some sort, which comes default with Webflow form elements. You can upload the file (if it is supported by Webflow) to the Webflow Assets manager and create a text link that links to a copy of the file. (Please see Configuring Success and Error Messages here AND Using Assets here.
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Redirecting on form submission: You could also either create a separate page that contains the file download link OR host the file on a service like Box, Google Drive, or Dropbox - and simply redirect the user to that page/link after they fill out the form. (Please see this forum post.)