WPML includes an auto-update mechanism, which allows you to receive updates and install WPML components. If you need help, make sure that you have read the Installation and Upgrade instructions.
There is an invalid key error when I want to register WPML. I already added the key on wpml.org.
Solution:
Such an issue is usually related to the usage of an old version of the WPML plugin. If the current version of the plugin is older than 4.4 you need to use the manual update method below: