Here's good news. Sony Mobile made their new Xperia Home launcher compatible with Android 4.4 KitKat. Previously this Xperia Home launcher was only available for Android 6.0 officially. But some developers were able to port it to Android 5.0 too. From now on Xperia KitKat users now has a chance to taste the new Xperia Home launcher.
So to install this you must remove the Xperia launcher 10.0.A.0.30 which I shared recently to avoid conflict between the two apps. This new version only consists with bug fixes. Keep in mind that after installing this you'll no longer has the previous Xperia Launcher which was the default in Android 4.4+ devices. That means this will replace the previous launcher. Its still on beta. You just need to download and install it just like another app. Download from the below
Download APK Here