Background of the issue:
I am working on a site under development and trying to use WPML with the domain hidden link.
Symptoms:
The domain hidden link is not supported by WPML for the development site, and I am unable to open the website.
Questions:
Why is the domain hidden link not supported by WPML for a development site?
How can I resolve the issue of not being able to open the website?
I am not sure what you mean by your request, can you please explain what is wrong and what happens?
In your shared image, the message says that you are using the WPML All Import addon, but do not have the required WP All Import plugin. That is 3rd party plugin for import for which we have an addon that is called WPML All Import, if you are not using WP All Import then you do not need it: hidden link