This is an external option which you can use to help your customers downloading your App in front of you and get a discount :

1. Go to http://www.onelink.to
2. Insert the App name in the search field and press Enter
3. Click on the App Icon and both Apple fields and Google play will be filled automatically
4. Click “Lock” 
5. Test it directly on the screen before choosing with format version you want to download
6.  Open a MS Word document and Insert the PNG o SVG file at the bottom of the document like below.

LINK: https://support.migastone.com/en/hrf_faq/how-to-help-your-customer-to-download-your-app-easily/