upgrading to gmax 1.2 help

Hi all,
I have downloaded gmax 1.2 from the turbo squid web site, but when I go to upzip the file, it keeps asking me to insert disc labelled gmax. I have uninstalled gmax 1.1 and tried to unzip the file but get the same message.
I have tried to unzip 1.2 with 1.1 installed but still no luck. What gives
Cheers
Rhys
I have downloaded gmax 1.2 from the turbo squid web site, but when I go to upzip the file, it keeps asking me to insert disc labelled gmax. I have uninstalled gmax 1.1 and tried to unzip the file but get the same message.
I have tried to unzip 1.2 with 1.1 installed but still no luck. What gives
Cheers
Rhys