I suggest you ask the people of the mod about stuff like that; they should know how their mod has to installed.
If you're using the Origin version of C&C Generals, please verify that the mod supports this version, and if there are any specific instructions for installing it on an Origin installation.
To find the installation folder in Origin, open the Origin menu and select "Application Settings". In the settings screen, go to the "Advanced" section. Copy the address in the grey box, paste it in your Windows file explorer's address bar, and press [enter]. In the folder where you end up you will see the actual installation folders of your games.
Thanks Nyerguds I will check that our later today.
