If you manage to run this specific version, here is what you will find that differs from both CS6 and modern CC.
This revolutionized portrait editing by automatically detecting facial features (eyes, nose, mouth) and providing sliders to adjust their size and position without manual warping. photoshop cc 20155
If you find a verified copy of Photoshop CC 2015.5, keep it on an offline virtual machine. But for daily work, let the "20155" ghost rest in peace. If you manage to run this specific version,