All tax preparation and accounting software nowadays support the export to PDF format and H&R Block Tax Software (for both Windows and macOS) should be no exception in this. You can use the default PDF export function to print tax 2014 forms as .pdf documents, typically for the purposes of printing.
It may also be possible that other tax preparation or accounting programs may be able to import historical data from .t14 files and export them as PDF documents as well, i.e. basically achieve t14 to pdf conversion.Open T14 file Open PDF file
A tax preparation software
A Mac version of popular tax software