Thank you for contacting WPML Support. This type of issue usually happens when the WPML is not registered properly on your site. Could you please delete the existing site key and create a new one by following below steps:
1. Login to your WPML.org account >> Go to the Sites page: https://wpml.org/account/sites/
2. Delete the existing site key by pressing the little trash icon.
3. Login to your site and go to the Dashboard >> Plugins >> Add new > Commercial tab and click the Unregister WPML from this site link if that link exists.
4. Then click the Register WPML link.
5. Click the Get a key for this site link (screenshot attached).
6. It will generate the Key for your site.
7. Copy the key, and paste it back into the input box, and press the Register button.
8. Take a backup of your site and try to update the WPML plugins.
Please let me know if this resolves the issue or if you need further assistance with this issue.