Simply follow the 10 step installation guide found here:
Once you have purchased Realtime-Spy please jump to the next step: Configuring
By installing Realtime-Spy you agree to the standard legal disclaimer
and EULA specified HERE.
Realtime-Spy must only be installed on a PC that you own, or you
have permission to install it on. Doing otherwise is a legal offense
in most states/countries.