Mack,
Don't want to lead you down a wrong road, but a couple possibilities.
The file is so big, the not responding may be just that it takes excess time to read everything in processa of unpacking it.
You could download a trial of WinZip which handles larger files than some of the windows managers.
If winzip can't open it, good possibility that the download file is corrupt. I had problems on a win 7 rig with weird messages that the installer wasn't compatible with the operating system. That was trying to install from an external drive. Had to retransfer the file a second time to the C drive. So try copying the zip file to your C drive and extract from there.
Try two and everything went smooth. Program is rock solid and everything works the way it is supposed to. Really a welcome addition to the orchestral stuff.
John
looks like Sid beat me to the main points