It depends on which mod your talking about since there are dozens but two sites that probably have the one your looking for are moddb.com and gamefront.com
Yes, it has the original 'Command and Conquer: Generals' AND 'Command and Conquer: Generals, Zero Hour'
Command and Conquer: Generals Zero Hour is an expansion to Command and Conquer Generals. Install Command and Conquer: Generals then install the expansion pack to play the expansion. In the menu where you select the game you want to play, the button that says "Command and Conquer Generals" should have a button directly below it that says something like "Command and Conquer Generals Zero Hour" PS. this is for command and conquer: the first decade. Other wise you will need to download the separate game or buy a separate disk.
The Command and Conquer - Generals - Zero Hour product code is located on the packaging with the software. It is a 22 digit number with three dashes.
Command and Conquer Generals (Zero Hour) World Builder http://www.cncgeneralsworld.com/generals/zerohour/worldbuilder/
You can't
1 disc
Command and Conquer Generals Zero Hour - 2003 VG was released on: USA: 22 September 2003 UK: 26 September 2003
Yes it is in the C&C Zero Hour Root Folder
Global Liberation Army
Anthrax Gamma
It is at the very bottom of C&C (tm) Generals Zero Hour file
Karina Thomas played the role of General Alexis Alexander (Superweapons General) in Command and Conquer Generals: Zero Hour.