ArduinoIHC now in library manger
The ArduinoIHC library for creating IHC in- and out-put modules is now included in the Arduino Library manager. This mean you can install and update through the Library Manager within the arduino IDE.
If you have previously downloaded the library and installed manually, you should remove it and install it through the Library manager. This makes it easier to get updates in the future.
If you prefer to do it manually you can always get the latest version here:
Here is the original post about ArduinoIHC (It is in Danish – use google translate)