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For your own protection
If you're running the installer on Windows 8, a screen-width message bar will pop up, making it look as if Windows is preventing the installation. The solution is easy, though counterintuitive: clik the More Info link, highlighted here.
The More Info screen is actually where the needed manual override option is placed. Click the "Run anyway" button.
Let 'er rip!
Now the Welcome screen of the installation wizard should appear. Click the "Next" button to proceed.