From the install location of the steam install, make a shot cut of the gameguru.exe program to your desktop. Than it opens gg and does not use the steam stuff. Also multi-player will not work in this mode.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit