You can save SketchUp 8 files as SketchUp 7, 6, 5, 4, or 3 files. To save a SketchUp file in a format compatible with earlier SketchUp versions:
- Open the file in SketchUp 8. The file appears in the drawing area.
- Select File > Save As. The Save As dialog box appears.
- Navigate to the directory where you want to save your file.
- Select the file type from the 'Save as type' drop-down list.
- Click on the Save button. The file is saved.