Usually when I option-click a single page link, Chrome tries to download the page, but when I option-click on PDFs, Chrome doesn't respond. Is this the default behavior and is there some way to change this? Also do other browsers allow for this type of one-click download? (I know if I turn off in-browser PDF reading that all PDFs would be downloaded, but I don't want that as the default action.)
Go to Chrome settings > Advanced
Click on privacy settings > Content
Scroll down to Plug ins
Disable Individual plug-ins
Chrome PDF Viewer
That will unfortunately disable it for all PDF preview.
But the good news is
now you have the simple one click on a PDF link and it will offer you to download the PDF file.