1) Download Setup.exe (CyberJass V4.1) and save it in the folder of your choice.
2) Launch Setup.exe and follow the on-screen indications.
Previous versions:
CyberJass v4.0
CyberJass v3.1
CyberJass v3.0
CyberJass v2.0
Please see the french equivalent page for the change log.