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Download psr-2.1.22210-demo.msi from the link above. Get the antivirus program to check the file for malware. Try free Comodo Antivirus. After installation of 1.8 MB, double-click on it and follow the setup instructions.
You won't face problems with uninstalling the program. Click Start and then Control Panel. Choose Recovery for Photoshop and press Uninstall.