This is not a stand alone widget, it is a skin for zooper widget pro, To work it needs zooper widget pro 2.3.8 or better in the device.
-Download zooper widget pro http://play.google.com/store/apps/details?id=org.zooper.zwpro&hl
-Install Galaxy S6 for zooper widget
->From widget setting select a widget zooper 4x2 and click on it, select Zooper Widget skin Galaxy S6. If you get some issues with the dimensions of the widget you can solve getting in the setting and play on the scaling to increase or decrease of the widget, for every problem don't let negative review, contact us and we will help you with every problems.