Arduino library for SI4463 wireless module

I'm doing project like wireless motor switching and monitoring system.

For this I'm planning to buy a pair of si4463. It is stated that can penetrate through the wall, 2KM range with 443MHz (Heard that low frequency is stronger than high-frequency modules such as NRF24L01+) with Arduino Uno.

With lots of searches found out only one library RH_RF24 (radio head) library with too low documentation for this module, Peoples didn't even tested it :confused: .

Can anyone help me with this?

module: SI4463 Wireless Module.
Library: Githib

I'm not getting, from where to start. Confused to buy this module or not. (Already wasted money by buying NRF905 module).

Thanks.