If you are looking for "paper" in the sense of documentation, a manual, or an overview for this specific version, here are the core details:
While 2.1.4 is an older release, the developer currently offers for modern operating systems (macOS 11 and later). If you specifically need 2.1.4 for a vintage Mac setup, older versions are typically maintained in the Koingo Software download archives.
: The most current guidance is available in the Display Maestro Manual provided by the developer.