Go to Tools > Board > Boards Manager , search for , and install the latest version (v2.x.x or higher).
: Once downloaded, extract the contents of the zip file to a directory on your computer. rmaker.h library download zip
: If you're using platforms like Arduino or ESP32/ESP8266, you might need to place the library in your libraries directory within your Arduino or PlatformIO project. Go to Tools > Board > Boards Manager