i saw the 5-row keyboard in winterboard themes, but after checking it, and respringing, i still can't find it in general, keyboard, international keyboards, add new keyboard... the 5-row keyboard is simply not listed.
Try clicking, in keyboard settings, the topmost (you should have two: english and emoji). Here you can select which layout you perfer on your keyboard. Doesn't 5row show up there? There should be three different 5row to choose from here.