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 so you have to access the settings menu and make sure the “ Unknown Sources” box is checked. This will allow your device to install apps that come from other sources than Google Play Store. The next step is to connect the two devices together, the Android and the PC, and make sure you choose “Media Device” in case you are asked whether you just want to charge your phone or to transfer files.  Copy the file into a specific folder in your Android and tap it in order to start the installation. In case you want to install the mPK file for instance or any other APK file from your Android device and not from the PC, all you have to do is use the browser on your device and search for the app you want. The APK file will be downloaded directly on your device, so once this step is done you just go to Downloads and tap it in order to start the installation. As it was previously mentioned, there is a wide range of websites that provide this type of files for Android operating system dev...