All tax preparation and accounting software nowadays support the export to PDF format and At Home is no exception in this. So you can use the default PDF export function to print your tax 2014 forms as .pdf documents. The software is available for both Windows and macOS machines.
There doesn't seem to exist a 3rd party viewer for .t14 files, so using the original accounting software seems to be the only viable choice for conversion of t14 to pdf.
As far as we know, only At Home app uses .t14 files, so if you are looking for some other t14 to pdf conversion, please let us know in the discussion below.