This error message shows when you try to activate Magic Members on your site.

We are sorry, the email (your@email.com) is not valid for the product (Single License/3 Users License/Unlimited License) or not registered with us.

This can mean couple of things:

  1. You entered incorrect email address. Please check your purchase email address and use it to activate the plugin
  2. You changed the plugin folder’s name (magicmembers). If you do that, the license type will show differently and will provide error. So, if you changed it, delete the plugin and upload it again without modifying it.