When trying to start zero hour it says instalation not found

Hi this is my first time here and just found out about this and when i try to start it in the tool it just says it cant find my installation. i purchased through origin.

You shouldn't use the C&C:Online launcher to launch Generals or Zero Hour. If you are playing only those games, you should unhook and uninstall the C&C:Online launcher and install GenTool. When you have done that, you just launch the game from its ordinary shortcut. If you are using the Ultimate Collection, you should install this first; C&C Ultimate Collection Launchers.