Thanks for packaging a newer version of this utility. But I discovered that MacPorts also installs version 6. I ran "sudo port install unzip" and version 6 became active after restarting the terminal.
MacPorts installs it to /opt/local/bin, so there's no collision with the default copy of unzip in /usr/bin. The order of directories in the PATH takes care of finding the newer one.
Is there a reason I should prefer this package to using MacPorts?