All custom edge drivers are installed in the same way.
Follow the link that the author gives you
Subscribe to the channel with the hub you want to get the new driver.
Select the drivers you want to download to your own hub. These may come very quickly or it can take a few hours.
Once the driver is available on your hub, you will be able to go to the details on the device page in the smartthings app for that device and select it.
Again, please see the community FAQ, it explains all of this, and more:
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)