Installation went well on my macbook8,1. Late 2011 13” pro.

However, I had to go to disk utility to mount the ssd drive, then go back and install the patch.

And……the camera does not work nor does the screen brightness buttons. After multiple tries with terminal and terminating vcd and appleassistant, etc etc, I reverted back to High Sierra. No fix possible.

But, the guide above is very good and made my job easy. Thanks!