Select your Quake (or eQuake) dir as the target dir for the installation.

You need original Quake 1 to use the ezQuake client.
Note that there is also eQuake pack out there.
http://equake.quakeworld.nu/ 
ftp://ftp.yi.se/pub/software/equake/

ezQuake homepage: http://ezQuake.SF.net/
Visit us on IRC: QuakeNet, #ezQuake
