KeyCastOW by Brook Hong is a keystroke visualizer for Windows, lets you easily display your keystrokes while recording screencasts.
Web Page: https://github.com/brookhong/KeyCastOW
Note of SPS Publisher:
The last 2.0.2.5 version seem contain a virus so the author don’t provided binary now.
The 2.0.2.3 is a secure version so I highly recommend to backwards to this version.
This can be easily do in SyMenu
Mirror download link: KeyCastOW 2.0.2.3