Here is the instruction!
1. Install Steam, login, select Postal 3. Then select "Delete local content".
2. Exit Steam.
3. Then press "Windows + R" and type:
"X\Steam\Steam.exe" -install Y:Where
X is the path to your Steam folder and
Y is a letter of your DVD drive.
4. Press OK button.
That's all!

P.S. Check your PM. I have a little request.
