How to enable RPI-WIFI-2 in Raspberry Pi OS

We recommend you do the below commands via a SSH connection to allow copy & paste.
However, they will still work fine in Raspberry Pi OS terminal.

Update Raspberry Pi OS 
sudo apt-get update
sudo apt-get -y dist-upgrade
sudo reboot
Install Driver 
cd ~
wget https://pishop.nz/static/downloads/install-wifi2.sh
chmod +x install-wifi2.sh
./install-wifi2.sh
sudo reboot
Done

Note:
Each time your kernel updates, you will need to install the driver again by running the above install-wifi2.sh command.
Hopefully in the near future, the driver will be added into Raspberry Pi OS and therefore no longer need to be installed.