If you refer to Blender 2.79, the addon has been out of maintenance for a long time.
If you refer to current versions of Blender, the addon is included by default in Blender and it is officially maintained (If you enable the addon, always from the addon preferences it is preferable to choose a different path to the Blender config folder for the libraries). If you are having a problem with the addon in Blender 2.8+, you can report the problem to the Blender official bug tracker.