If you need the material for a non-profit or educational setting, consider:
For those using digital whiteboards, the official edition provides the highest fidelity for classroom use. DaF Spiele: 66 Wechselspiele 66 wechselspiele pdf high quality
If you have already downloaded a poor copy and cannot find a better one, you can use post-processing to simulate high quality: If you need the material for a non-profit
Since I cannot distribute copyrighted material, here are legitimate ways to acquire the PDF: consider: For those using digital whiteboards