Extract the QwynnUI XML file to your (C:\Users\InsertNameHere\AppData\Local\SWTOR\swtor\settings\GUIProfiles) folder.
As the screenshots suggest, the hotbars have been 'rearranged' in order to achieve the desired aesthetic of this layout. As such, you will probabily be required to change your keybindings in order to properly use this UI.
SW:TOR's default 'MainBar' has been switched into an alternative bar (shown directly below the player frame).
SW:TOR's default 'QuickBar 2' now functions as the primary hotbar (shown to the left of the minimap). You will probably want to rebind your promary abilities here.
SW:TOR's default 'QuickBar' now functions as the secondary hotbar (show to the right of the minimap).
SW:TOR's default 'QuickBar4' remains an alternative bar to mirror the original 'Mainbar' (shown directly under the target frame).