Hi @wordpressmikeuk and many thanks for your answer.
1) what should I ask OVH exactly? the correct file structure?
2) ssh : to complicated for me, i’m afraid
3) with Filezilla, chmod 755 for directories and 644 for files : this I can try.
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last year, we were heavily attacked and i had to reinstall everything. i also changed file permissions. i put 505 for directories and 404 for files. of course, after that, there were many thaings that did not run correctly, so i had to change this for a few directories.
yesterday, i installed wp latest version. but to do it, i changed the chmod for the entire website, which was not necessary, and turned it to 777.
after that, i changed it back to 505 and 404.
and i could not upgrade the plugins anymore.
so i’v tried several combinations of file permissions on different directories, but without success. the latest combination was 777 on wp-content directory, and 777 on the plugins directory and sub-directory.
uploads was 767 (!)
but, i’m now applying what you’ve said.and…. it worked !!!
what can i say ?! thanks, and thanks, and thanks again !!!