You don't have to download the whole client, downloading the patch is enough.
But you have to patch the EPW client correctly.. It is simple.
Once you unpack the patch folder, open it, select all files (ctrl + A) and press ctrl + C
Go to EPW Client folder and press ctrl + V.
It will ask you if you agree to replace the files. Click yes to all.
Then launch the game from EPW_launcher.bat
