Nicefu
Players on v436 can still use the browser to find servers if they make the changes to their ut.ini shown in the link above.
They could also still connect to servers that are already in their favorites or connect to servers if they know the IP address and port of the game server.
It is my understanding, the changes will automatically be done for you if you patch to v469c using the .exe patch version/method.
It's probably best to just do the patch.
https://eatsleeput.com/d/171-unreal-tournament-v469c-release-public-released