The Nevada NTTR installs just like any other DCS module. The only difference is that this Terrain requires DCS world 2, and will not work in DCS world 1.5. Lucky for us, DCS world 2 is absolutely free to download from the DCS web site.
This is a companion discussion topic for the original entry at https://www.helisimmer.com/previews/nevada-test-and-training-range-map-for-dcs/