Google’s Android is currently leading the mobile operating system worldwide market with 75 percent share. Android is on top because of the number of apps available at the Google Play Store and above all the majority of the apps are free to use. Android users can install apps via dedicated Google Play Store app but there is another way of installing it manually by installing the .apk file with the help of any file managaer. You will be required to install a file manager app before being able to install the APKs manually.
These are the only two ways of installing an APK from your Android device. But there’s another method through which you can install the app using your PC, this will certainly rejoice the users who mostly use their personal computers. XDA Senior Member quangnhut123 released the final version of the APK Installer Tool that supports all Android devices. Though the APK Installer is currently available for Windows PC, the method is very simply to install the APKs on your Android device. You need to check both USB Debugging and Installing from Unknown sources boxes before moving on. Now just simply plug your device to PC with the help of USB cable and open the APK Installer Tool and then simply drag and drop the .apk file you want to install on your Android device. And then the apps will auto-install and soon you will have the app install on your Android device. This APK Installer Tool also has other couple features that includes,
**There are 2 options : Internal Memory and Reinstall.
+ Internal memory : Install apk file into internal memory (phone memory not ex-sdcard). By default this tool will install into ex-sdcard.
+ Reinstall : Reinstall program that corrupted .
If you have many APKs lined up to install and want the fastest way to do it then surely APK Installer Tool is best suited for you and since it is stable and comes with some additional features as well, it surely falls in a must try category. Check out this original thread for download links and more information about the APK Installer Tool.
Source: XDA Developers