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You should display the link to download the file on the "Thank You Page", please follow these steps.
1. Click on the Thank You icon on the top tool bar.
2. Click on Edit Text.
3. Add the link, you may just paste the link or using the wizard as shown in the image below.
4. Once you are done, click on "Save Changes".
The link will be shown once the form is submitted and your users will be able to download the file on the link.
Hope this helps.