The client attempted to install the WPML Multilingual CMS plugin using Composer with version '4.6.14' and encountered an error indicating that the file could not be unzipped, suggesting it might not be a zipfile or is part of a multi-part archive.
Solution:
We regret to inform you that installing WPML using Composer is currently not supported. This feature has been requested but has not been implemented yet due to certain limitations.
Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket for further assistance.