If you are interested in development, you should install Gccg with Cygwin as explained in the
Cygwin Installation guide.
Otherwise:
download the
General Windows Installer
;
unpack all files to your harddrive;
run the game installer
where <game> may be lotr, metw, mtg or pokemon
Each game module has a startup script with the same name as the module, with capitalized first letter and .bat extension. You can launch the game using it.
i.e. for metw module run
Also card images can be installed using the .bat script referring to the graphics you want to install.
i.e. to install metw card images run
To update all installed packages run