Millions of Android apps are available to download and install in Google Play store, but you cannot install through your PC using apk file using Google Play store offline installer. If you wish to install higher version of app in your lower version of android mobile you can't download it through Play store .
If you want to install higher version of android app in lower version of set its possible by downloading Mobogenie PC software or Mobogenie mobile App. You can download and install mobogenie software in your PC with which you can install apk file or download million of apps through its store too. If you want to download Youtube videos in your mobile phone it can be best for you. You can see download option in each videos you watch in your mobile. Download PC Mobogenie Software and enjoy!