Downloaded and tried to install several times, but the installer issues an alert at the end of installation, at "Validating Packages" stage: "The installation failed. The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance".
Repaired disk permissions, changed System Preferences to "Allow apps downloaded from Anywhere×´, ran DiskWarrior, changed "sudoers" in etc folder to "Read & Write", changed manually permissions of Applications folder to "Read & Write", but to no avail. What else can be done ?