Full client means you get an installation package that will contain all files needed for the game, including the patcher, game client EXE, BGM, DLLs, GRF (game assets) and other files. The EXEs you see on the NEMO site are just the game client, they cannot be used standalone. It would be best if you pick a full client package close to your intended EXE date and then patch it appropriately. Patching to latest might not always work with an older EXE.