impossible to update wordpress

Bonjour,

J’ai un site que j’avais fait il y a quatre ans, le site avait été mis en ligne puis la personne n’ayant payé il a disparu. Je l’ai donc remis sur mon portfolio mais impossible de le mettre à jour.

Hello

I have a site I made four years ago for a friend, to show people what I did I uploaded it on my own page.

https://downloads.www.ads-software.com/release/wordpress-5.3.2-new-bundled.zip…

Error

download didn’t work : checksum (324886473ab2f6ea977c6a95b27680e0) doesn’t match what’s needed (f4dbbaacb55de911b7c8bd76929e5099).

Impossible to update

Can you help me?

It is my own theme, 5 plugins. Really it was a first taste to please a friend who didn’t have a website.

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