If Your Network Speed is Slow or Your Internet is about to end then in these type of condition you want to use messenger but messenger app is about 65-70 MB. So In these conditions, you have to use messenger lite app. This app is only 6-8 MB. In this short size, this app can be able to do everything you want by messenger. So if you install it from Play store or any app store there will be a great loss in your data. So the thing you have to do is to download its APK file. The full form of APK is an Android Package Application. To Open APK file it is not necessary that you have internet. This File can be open without internet. APK file is a package of the applications that can be run on Android. For example, if you have apk file of messenger lite in your mobile. So if you want to install messenger lite go to the apk file of messenger lite and open it and now you can install it.