[Gelöst] WPML Multilingual CMS plugin is not installing

Background of the issue:
I am trying to install the WPML Multilingual CMS plugin, but it continuously displays a loading icon during installation attempts. The issue can be seen at the following link: versteckter Link.

Symptoms:
The installation process does not complete and instead shows a continuous loading icon. I expected the installation to be successful, but it remains stuck on 'Loading....'

Questions:
Why is the WPML Multilingual CMS plugin not installing?
How can I resolve the continuous loading issue during installation?