I am not seeing your steam link button.
Please press the green help button and let them know that you need your steam link to be reset.
They will help you in getting it working.
Thanks
Sometimes clearing your browser cache also helps this out.
Close and reopen the browser afterwards.
Log onto the store.
Stay logged in on your browser on the store page then try and open Game Guru again and press the download option from the files menu.
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, Screen resolution 1680 x 1050.