Please choose the file mentioning the product you are trying to install. Some files are country specific, please ensure you choose the applicable manual. Here is an explanation for the terms TC2 and TC3 for Australia:

• Terrain Category 2 (TC2): Open terrain, including grassland, with well-scattered obstructions having height generally from 1.5m to 5m, with no more than two obstructions per hectare, eg. farmland and cleared subdivisions with isolated trees and uncut grass.
• Terrain Category 3 (TC3): Terrain with numerous closely spaced obstruction having heights generally from 3m to 10m. The minimum density of obstruction shall be at least the equivalent of 10 house-sized obstructions per hectare. e.g. suburban housing or light industrial estates.