We must access our Plesk server and go to domains and click on the domain where we want to install our Magento. The first thing to keep in mind is that Magento requires at least version 5.6 of PHP to install and function, so we make sure it is installed and if not, we change it:

If it's not that version and we have a lower one, we will have to change it as explained in this guide:

https://www.profesionalhosting.com/soporte-en-linea/panel-de-control-plesk-/cambiar-versin-de-php.html

Now we go to the Applications section:

All Featured Applications:
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We look for Magento:

Now we click on Custom Installation:

Accept the terms:

We fill in the fields with the data of our website and click on Install:

It will start to Install:

Once installed, we will see the installation in our Magento installation interface:

After clicking on it, we will have access to the installation data, administrative username, administrative password, and a direct access to it which by simply clicking on it will take us directly to the administration.