The InDesign templates are reserved for users who can work creatively with the design at a more professional level. The templates makes it a bit easier to produce a broad range of products within the framework of the AU design.
You can download templates in InDesign to create posters using the AU design in the following formats:
A0: 841 x 1189 mm - see examples
A3: 297 x 420 mm - see examples
A4: 210 x 297 mm - see examples