1. Copy all the files into the Fallout New Vegas "Data" Directory
2. You always have to activate NevadaSkies.esm
3. Choose between the files listed below and only activate one of them, never together!

- NevadaSkies.esp -> This file has to be activated if you do not own DLC Content Packs
- NevadaSkies - Ultimate DLC Edition.esp -> This file has to be activated, if you have all FNV DLCs.
- NevadaSkies - TTW Edition.esp -> This file has to be activated, if you have Tale of Two Wastelands installed.

4. Put the ESP-File of your Choice at the very end of your load order! Delete the other two ESP-Files.
5. Now your Fallout New Vegas "Data" Directory should hold the files listed below:

- meshes/sky/clouds.nif (has to be out of the BSA-Archive to work correctly)
- NevadaSkies - Main.bsa
- NevadaSkies - Sounds.bsa
- NevadaSkies.esm
- ESP of your choice (see point 3)

6. If you miss any of these files, it won't work.