Hello Uday, 

I hope you are doing well. 

This is possible on Odoo. Here a the different steps to follow : 

• 1. Activate the Developer Mode
• 2. Go to Settings / Technical / Database Structure / Attachements and Upldoad the file you want to be downloadable on your website
• 3. Go in list view > Select the Files that you want on your Website and export the local_url. 
• 4. In your Excel Sheet copy the local URL. This will start with /web/image/
• 5. On your Website builder create a button or a link and paste your local_url in the URL or Email section.
• 6. Enjoy your Website with your files :) 

I hope this solution will help you ! 

William (wima)