How to prevent Acrobat Reader from automatically opening downloaded files

Hello,

It seems as though after a recent update of Acrobat reader,

Acrobat reader. automatically opens the PDF files that I have download from the internet . 

I want the downloading process and the opening process to remain separate.

(Acrobat reader should only open the files when I open then on my computer) 

How do I stop files that I download from automatically opening when they are downloaded? 

Thank you