[Publish 122] Update the client to connect to the game servers.
If you are receiving an error connecting, such as ‘I cannot connect to the UO server,’ please update the client.
'This release also includes mandatory client patches for the Classic & Enhanced Clients, so be sure to patch fully before trying to access the game servers.'

Comments
For CC you should run the UO Patch file to load the game. It will patch when needed.
CUO also auto patches when you load.