This, you can make it with this link for example: https://www.qr-code-generator.com/
The information to put in the above QR code would end with “/export”. For example:
https://docs.google.com/presentation/d/1123459789-abcdefhtiziuer/export
When scanning, people would be then redirect to a download process of the document.
For reference:
https://medium.com/@bazroberts/google-url-tricks-16011ca96285
