1.
Use Studio to generate a URL that will be added on the website
directly in a specific place.
Go
into Settings --> Technical Menu --> Attachments
Upload
the PDF you want to be downloaded from the website
Open
Studio and add on the attachment the existing field called Website
URL
The
field will generate automatically an URL to be attached on the
website in order to allow the download
Go
on the website and selected a place where you want this link to be
clickable and downloadable (can be a word in a text, etc)
Open
the edit mode and click on CTRL + K (or select Link icon from the
edit menu)
Add
now the URL generated from the attachment with only basic domain
name of the page / URL generated with Studio and activate option
open in new window and save
Click
now on the link and Odoo will open a new window with the document
selected
2. Add an external URL in a specific place on the website that
will redirect to the download
page
If you don't have Studio you can create a public drive where you
can store the documents that you want to be downloadable from your
Website
The same above procedure will apply.
You will decide where you want the link to download you want to be
and you will add a direct redirection to the URL of your document in
the drive.