Client? Just make a copy of your FOnline Folder, make a folder called like TLA or something, more all of your 2238 files there, and then run Updater.exe with address: 88.212.201.245 / 4040
That will get you the files needed for TLA.
You don't need to make a separate TLA folder, but it is much more convenient if you like switching between TLA and 2238.