From now HappyAddons free version (v2.9.0) comes with the support of the WPML Multilingual CMS tool. You can manage your multilingual site with the help of this tool. Here is the official tutorial video by WPML on how you can use it in Elementor and the process is the same as it is.
How to Translate Elementor Pages Using WPML
New WPML makes the translation process simpler for those pages built with Elementor.
Here is a detailed guideline of how you make a multilingual website with the help of the WPML tool. ?
If you are looking for the official documentation please have look on it.