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How do I change the license key WHMCS uses?

As a 20i reseller, you can buy a discounted WHMCS license. If you have a pre-existing WHMCS license, you'll then need to change the license key in your WHMCS system.

To do this, log in to the admin area and go to Help > Change License Key.

You can then enter your new license key, along with your admin login details to verify the change.

If you are getting a 'license invalid error' - so that you are unable to login - there is a link to the Change License page from that error page. 

Further instructions can be found at: WHMCS Support - Licensing.