Please send an e-mail to: orders@ableton.com

Subject: "Lost my Ableton Live Lite serial number".

Body: The name of the Line 6 USB hardware device that your copy of Live Lite came bundled with.

Attachment: Proof of purchase of Line 6 USB hardware device.

Ableton will be more than happy to help you with this issue.

If you require phone support (in the US), please contact them at:

Tel: (646) 723-4572

Monday-Friday from 12:00pm to 4:00pm (Eastern Standard Time)