Nokia launched its own launcher application for all android devices to optimize your home screen UI to new era to present the right apps, contacts and websites based on how you use your phone. As per official developer Z Launcher is currently optimized for popular devices including Nexus 5, Galaxy S5, S4, S3, Moto X, HTC One and Sony Xperia Z1 running on android 4.1x (jellybean and 4.4.x kitkat) or higher OS that means Zlauncher not supports for android 4.0 ICS, 3.0 Honeycomb, 2.x gingerbread devices also not installable at rooted devices too. Unfortunately this app not available in google play store link, available to download via zlauncher.com official website by following a quick sign-up procedure to download Zlauncher apk file.
Download apk file
Via Zlauncher.com and zlauncher.apk file size of 5.77MB from third party site
Tips to install Zlauncher on android apk
The following three steps to install this launcher apk file to all android devices
Unlock your android (only for nexus devices and Moto X)
Download apk file from official site or third party sources
Save it to device and Open Settings -> Security-> check to Unknown sources option and install it.
Note: The screenshot from Samsung Galaxy Grand Duos GT-I9082 running on android 4.2.2 Jellybean and Xolo Q700i not supported for this zlauncher.apk file.