Ignore it. Developers include these so that the plugin or theme can update automatically or so that you can register for support. The item itself will work perfectly fine without any activation code.
Also, every plugin or theme purchased from us comes with free and unlimited updates for an entire year, so we’ve got you covered.
If the item you bought from us can’t work without a key, let us know if you would like to get a refund or exchange it with another plugin or theme.
All refund requests will be evaluated on our end, and we will refund your purchase if the item can’t work without a key.