Quote from the docs: You begin the lesson by loading digital images of a live-action sequence. You'll work with images we created for your use. - In the Setup control panel, click the Browse button next to the Full Res Image box. - Navigate to the UnlimitedLessonData/Live directory and select any image file from the list, such as shot1BG.rgb.0001. - Click the Open button. Live loads the entire image sequence, from shot1BG.rgb.0001 to shot1BG.rgb.0240.