Instructions on how to use the style are outlined the included Readme
Embarcadero Android 4.4 Style for FireMonkey for use in Delphi and RAD Studio XE5
To add style support for Android 4.4 to your Android application, follow these steps:
1. Place the TStyleBook component onto your form and rename it to KiKatStyleBook, for example.
2. Load the AndroidLight.fsf or AndroidDark.fsf KitKat style to the KiKatStyleBook.
3. Create a TForm.OnCreate event, and add this code:
if TOSVersion.Check(4, 4) then StyleBook := KitKatStyleBook;