A requirement of a forms project that they we’re undertaking is that a copy of the form is available for download and offline completion. To this end they wanted to convert the most up to date version of the form to PDF.
I’ve had a look at a couple of guides for converting XSN to PDF and the most straightforward one (without putting in custom code etc) seems to be the Windows patch for office 2007 – https://www.microsoft.com/downloads/details.aspx?familyid=F1FC413C-6D89-4F15-991B-63B07BA5F2E5&displaylang=en.
It doesn’t work with forms in design mode, you must open the form in InfoPath as if you we’re going to fill it in. Then there’s an export option through File > Export To > PDF or XPS. Job done!