Now, see what version is your client currently. Don’t tell me you don’t know where to see it. It’s in the launcher’s title. It should be like “ECO Client verXXX”. I will use mine as an example. Mine is currently version 347, so I need to upgrade to 348. Therefore, you have to create a folder named “D00000348″ in that eco folder.
Note for the new installation: The version will be “FullPackage”, and no folder D00000xxx. Instead, create a folder named “fullpackage” and continue inside that folder.