Andrew, I found the problem. Fortunately it was a mistake when we run the script and updating the installer fixed it. We don't have to dig deeper into your computer environment.
The new installer is uploading now and should complete in about 40 minutes. The file name did not change, but it is much bigger, about 200MB. It was faster to make one big file instead of breaking it into pieces. Please use the same download link in your email. It always links to the current installer.