Hobbyist still using 8 Pro

Install the latest version of Trimble SketchUp Make that your hardware supports. (Differing SketchUp version can be installed side-by-side on the same machine.)

We can now backsave to any SKP version. So basically you use a newer version as a file conversion utility.

See SketchUp Application Release Notes to catch up.

Also: Where to find Hardware Graphics Info for your SketchUp forum profile