Cant update or install plugins and themes

Hello Community!

I´ve started to update the website of a relative and some problems i have never had before showed up.

The page is now 10 years old and was never updated or worked on since then. I tried to install a new theme which worked, but then the troubles began.

I wanted to start the step by step php and mysql update, first install a backup-plugin. Didn´t work with the error message: “The file could not be copied.”

Then i thought i start to update the plugins and the theme that are installed. Surprise, the same error message: “The file could not be copied.”

I could not find any solutions for my specific problem.

Thanks in advance!

The page I need help with: [log in to see the link]

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