I'm trying to install the Nexus Media Importer app with an APK file, but I am frequently getting an "App not installed" error. I am not rooted and I have Nexus 5.

Any solution?

  • Did you check Security > Unknown sources?
    – geffchang
    Jan 29, 2014 at 14:31
  • What is the exact error message? Is the app you're trying to install already installed on the device (e.g. in an older version)? If you're installing it manually from an .apk file (side-loading), do you have unknown sources enabled?
    – Izzy
    Jan 29, 2014 at 14:32
  • Yeah I have installed other apks like a million times, and the app I'm trying to install is not installed currently ..when i press install i get a message app not installed that's it..
    – abhi
    Jan 29, 2014 at 15:04
  • USB Media Explorer claimed to be Nexus Media Importer app back in the past, and it's a paid app. This may or may not affect the installation.
    – Andrew T.
    Nov 15, 2021 at 12:09

1 Answer 1


Because this app checks your license. If you buy this app from the Play Store, it runs automatically. Otherwise, if you try a free version of this application, it shows the "application not installed" error.

  • While it's true that paid apps may check the license used in Play Store, I don't think the check is done on the installation.
    – Andrew T.
    Nov 15, 2021 at 12:09

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