@Daboomshot There are no outdoor range extenders. You could use an outdoor APs - here. In this case you'll need a cable connection to the outdoor unit and it won't be in mesh with other devices. A...

@David_Sammut If both devices support Easymesh you should be able to connect them using this guide. If one of the devices support OneMesh and another supoort Easymesh - use the Onemesh device as main...

@Brynta Make sure that you're wit the latest FW release for your RE - here. When you login its WebGUI you can see the connection status: How to login RE WebGUI - details.

@BunzZz If your main router is with a LAN IP address 192.168.23.18 then set TP-Link with a LAN IP address 192.168.23.254 and test.

@Bogart99 That would be best in your case. The main rule when using PoE is that devices should support the same/compatible PoE standard (voltage) - otherwise you can cause a damage.

@FelixMeow That's because it's not published yet on your local Australian portal. Use this link (US region) and choose "Still Download" to get it - you can get v1.0.9.