KineMaster can be installed on phones or tablets running Android 5.0(Lollipop) or later.
Thus, if your device is running Android lower than 5.0, you can’t install KineMaster on it.
Besides mobile devices, Chromebooks supporting Android apps and Google Play Store are available for installing and using KineMaster.
KineMaster can be installed on any iPhone, iPad or iPod touch running iOS 11.4 or later, or iPad OS 13 or later.
Thus, if your device(iPhone, iPad, or iPod touch) is running iOS lower than 11.4, you can’t install KineMaster on it.