You can select which OH version to install via menu.
Just get the openHABian image and follow the install instructions. Check if your router properly assigns DHCP address and allows for connecting to the Inet. If you still have problems open a new thread please. Don’t forget to follow this as we can’t do 1:1 support on everything.
Not sure about WiFi, it’s said to work. But I’d recommend to use Ethernet anyway.
