Android 4.4 Kitkat Launcher For Android JB 4.2/4.3

Step 1 :Download The Files.

There are three files that you will need in order for the launcher to work. They are all standard Android features, just with different names.They're taken from the Nexus 5 apps.

• PreBuiltGmsCore.apk (Google Play Services 4.0)
• Velvet.apk (Google Search)
• GoogleHome.apk (Launcher)

You Can Download It As a Zip From Below Link

Step 2: Enable "Unknown Sources"  Since these aren't from Google Play, you'll need to allow the installation of outside apps onto your device. To enable that, go to Settings -> Security -> Device Admin and make sure Unknown sources is checked.
Step 3: Install the KitKat Launcher  After downloading the files onto your device, you can now go ahead and install them. When installing, you will receive a pop-up message stating that you will be replacing a system application.
Step 4:Setting Launcher As Your Current Launcher.You Can Simply Do that By Pressing Home Button After Installation. Select Launcher With a Blue icon.And now You Have The Latest Kitkat Launcher on Your Phone.