Unless you know what you need, I recommend that you use the New Zealand Māori (Alt) Keyboard Layout from the Download page.
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Two definitions are supplied here:
The Te Taura Whiri definition supports macrons by using the [ then Key method only.
The Te Taura Whiri Combo definition allows macrons to be generated using both the [ then Key method, and by using the [AltGr] (Right Alt) key in conjunction with the vowel.
Download New Zealand Māori (Te Taura Whiri) Keyboard Definition
Download New Zealand Māori (Te Taura Whiri Combo) Keyboard Definition
Source files are also supplied, for those who are interested. You don't need these if you just want to use the keyboard layout.
Download the New Zealand Māori (Te Taura Whiri) Keyboard Definition source file
Download the New Zealand Māori (Te Taura Whiri Combo) Keyboard Definition source file