There is only one download. It runs as a free trial until you enter a license key.

Trial: the music stops after 8 minutes.

Licensed: enter your key and listen to music, forever. Buy a license here - no need to download anything again.

Note: Tonin asks for permission to count your keyboard and mouse activity - just how often you're typing or moving, never what you type. This all happens locally on your computer: Tonin works completely offline and nothing is ever recorded, saved or transmitted.

Macintosh: when asked about "Input Monitoring", allow it.