The primary reason users look for the "Full" version of 0.9.17.0 today is hardware limitations. If you have an old PC acting as a dedicated server or a first-generation NAS from brands like Netgear (ReadyNAS) or Synology, newer Plex updates might refuse to install or cause the system to crash.
Version 0.9.17.0, released in mid-2016, served as a transitional bridge for the Plex ecosystem. It focused on metadata accuracy and library depth, specifically for music enthusiasts. However, it is most remembered by the community as one of the final versions to support "legacy" environments before the platform shifted toward the more modern 1.x.x architecture. Key Features and Improvements plex media server version 09170 full