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Google CEO Sundar Pichai Warns Android Users Not to Sideload Apps
(www.gizmochina.com)
This is a most excellent place for technology news and articles.
All you have to do is download the APK from the F-Droid website and enable installing from third-party/unknown sources in the Settings app (some versions of Android ask automatically when you try to open the APK). I also recommend disabling unknown sources for your browser once you're done as a security measure.