Does my program have to be "Installed" to play in the Playlist?

As long as the NIKKI has access to the program and is added to the Playlist, then it will play when the Playlist is running.

Disclaimer
NIKKI products, devices, programs, and frequency files are wellness and educational tools only and are not medical devices. The information provided has not been evaluated or approved by the U.S. Food and Drug Administration (FDA), Health Canada, the European Union, or regulatory authorities in the United Arab Emirates.
NIKKI products are not intended to diagnose, treat, cure, prevent, or mitigate any disease or medical condition. No medical or therapeutic claims are made or implied. Content is provided for informational and educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
Use of NIKKI products is voluntary and at the user’s own discretion. Consult a qualified healthcare professional prior to use, particularly if pregnant, breastfeeding, or managing a medical condition.