Knx 1.x in openhab 2.3

Could someone please point out to me how I get KNX 1.x to work in openhab 2.3?

Go to Paper UI -> Configuration -> System -> Addon Management -> include Legacy 1.x Bindings and enable the switch.

Please uninstall knx2 if installed before enabling knx1.
Install knx1 from Paper UI:
Addons -> Bindings -> KNX1 Binding -> install

Please be aware that there are known issues with knx1 in openHAB2, which won’t be solved. Please be aware that you must configure all knx1 items through items files.