If your license key is not working, you probably you have either a 1 domain or a 3 domain license and, if you want to install eLearnCommerce on a 2nd or 4th domain, you'll get an error message saying that your license key is not working.
Follow the steps below to resolve this issue:
Step 1: Go to your CodeIsCode Account and Click on License Keys
Step 2: Click on Manage Sites.
Step 3: Click on Deactivate your site
Now you can proceed and install eLearnCommerce and license it on a new domain.