Mirf.h libraries don't exist

Got a sketch, first few lines are...
'''
//Transmitter program
#include <SPI.h>
#include "Mirf.h"
#include "nRF24L01.h"
#include "MirfHardwareSpiDriver.h"
Nrf24l Mirf = Nrf24l(10, 9);
'''

I get the error

transmitter:3:10: fatal error: Mirf.h: No such file or directory
#include "Mirf.h"
^~~~~~~~
compilation terminated.
exit status 1
Mirf.h: No such file or directory

I can't find a specific library called "Mirf" in the autoinstall library options and i've spent the whole day down a rabbit hole pulling random files from github and trying to install them to give me this library with no success. Can someone point me to a specific, idiot proof way of getting this library in and working as "just download it from github" and "just install it via zip" is what i've been trying and completely failing to do.

It looks like that library is on github: arduino/libraries at master · mberntsen/arduino · GitHub

Download everything inside the Mirf directory into a folder called "Mirf" inside your libraries folder

AMAZING, thankyou; that was exactly the answer i needed!