It was definitely something from the beginning of the installation.
fopen and curl are present and active on my server.
I'm sorry I didn't make a video with the way the error manifests.
I solved it by reinstalling the entire software. The only problem that remains is that when I want to install new plugins I am not allowed, or very rarely a plugin can be installed as if it gives me the impression that the place from which the download is made is a server that is started only once a day and only for a short time, maximum one hour.

Thank you for your reply and all help.