If you need the exact Final Draft 12 installer for Windows 8.1, contact Final Draft support – they may provide a direct download link.
Install Trelby , import FDX, export RTF, open in Word. fdx to word converter download for windows 8.1 pro 64bit
I understand you're looking for a way to convert (Final Draft) files to Microsoft Word format on Windows 8.1 Pro 64-bit . If you need the exact Final Draft 12 installer for Windows 8