How to install ButtonKing - TanPitch/ButtonKing GitHub Wiki
to install Button King library
Clone_from_GitHub
- go to release page and download the lastest version.

- or you can clone the library from main page

- extract files and place in location that Arduino keep other libraries.
- On Linux machines
Home > Sketchbook > Arduino > Libraries - On Windows and Macintosh machines
Documents > Arduino > Libraries - or you can find your location by
File > Preferences > Sketchbook location
- On Linux machines
Arduino_IDE
maybe work in the future.
Others
- PlatformIO
maybe work in the future.