On previous versions of Safari, I have been able to auto download PDF files by using the following code in Terminal:
defaults write com.apple.Safari WebKitOmitPDFSupport -bool YES
When I got a new MacBook Air running Safari 12, this option no longer works. Does anyone know of a solution while still using Safari. I run a lot of reports that I need to download and not just view.
Best Answer
The Acrobat/Reader plug-in for Apple Safari is based on Netscape Plug-In API (NPAPI), which is supported only till Safari version 11. In Safari 12, support for NPAPI plug-ins is removed, and hence the current Acrobat/Reader plug-in will not work. For detailed information, please refer to help articles Display PDF in browser Adobe Acrobat, Acrobat Reader
What’s New in Safari - Apple Developer
Source: Adobe.com