What does changing the version do? PDF files have a version number[1] but do you want to change that to earlier or later in order to achieve something? Can you explain more, please?<p>I did appreciate the screenshot colours -- strong memories of early Windows themes there :)<p>[1] <a href="https://en.wikipedia.org/wiki/History_of_PDF" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/History_of_PDF</a>