Open Lightroom 3.6.70 on your computer. Go to Help > About Lightroom. In the About Lightroom dialog box, press on the System Info button. Your serial number will be displayed in the System Info dialog box.

How to Find Your Serial Number in Lightroom 3.6.70 If you have already set up Lightroom 3.6.70 on your computer, you can retrieve your serial number within the software:

* Email Confirmation

Open Lightroom 3.6.70 on your machine. Go to Help > About Lightroom. In the About Lightroom screen box, click on the System Info button. Your serial number will be shown in the System Info screen box.