When you have purchased the program you will receive a download link. Download the installer and double-click it to install the program.

IMPORTANT: ON WINDOWS 10 YOU WILL GET A SECURITY WARNING FROM WINDOWS! This does NOT mean the program has a virus - it is just Windows warning you to be careful.

Click the link shown, and allow the installer to run. Keep the default settings.
When you have finished the program is ready to go! When you first run the program, enter the key you have been sent to validate the program for recording.