Instructions
Extract the 1.3 Base files into your "Oblivion/Data" folder. When asked if you wish to "Allow Overwrite?" click "Yes."
Launch "Oblivion Mod Manager" by double-clicking its logo and then click the "Create" button at the bottom of the screen.
Click "Add Archive" and choose "OOO 1.33 Complete Archive." Answer "Yes" to any question prompts that appear.
Click "Create Omod" and wait for it to finish compiling. Select the install options you want on-screen and click "OK." Your OOO mod script is now installed and will enhance your gaming experience.