How can i download catalina from appstore. It does work when my computer is with Monterey

Thanks for your answer. Unfortunately, the link brings me to the app store and the icon "GET" is in grey with a message like this : can't use this OS with your system. On my side I have tried to download from another site. The download worked well but the installation failed, so I brought my computer to the store for a full refurbishing with Catalina.

Thanks anyhow. Michel.