HERE ARE SOME INSTRUCTIONS I FOUND:
they have the instalation tutorial. part 2 is automaticly installed
But i can give you a simple intalation here
1. download the three parts
2. Download 7-zip (google it)
3. extract part 1 and 3 with 7-Zip (it HAS to be 7-zip for it to work) the extraced parts will have a installer for part 1, and a installer for part 3.
4.run the 2 installers.
5. After installing the two, you should get a .exe called ACW 3, run it and either click US or CS, then the game is launched.