How to install APK
APK Installer for Windows PC
Step 1. Make sure that adb debugging option is available
Menu => Settings => Developer options => check the box marked "USB debugging"
If it doesn't have a Developer Options setting, tap About Phone (or About Tablet), scroll to the bottom, and tap the build number 7 times.
Step 2. Connect android phone with your Windows PC (using the USB cable)
Step 3. Install your android device usb driver (Android usb driver)
Step 4. Apk Installer for PC will detect android devices and automatically install adb drivers.
APK Installer for Android
Step 1. Download the latest version of APK Installer for Android (Download)
Step 2. Make sure that your android device is able to install apk files from non-Google Play apps, as well as Unkown Sources (Menu => Settings => Applications and check the box marked "Unknown Sources")
Step 3. Launching the APK Installer on your Android device, and then tap "Install APKs".