Make a note of the Plesk License Key: Tools & Settings -> [Plesk] License Information

Installing Plesk
To install Plesk with the default configuration, follow these steps:

1. Log in to the desired server with the root user account.
2. To install Plesk, enter the following command:
   sh <(curl https://autoinstall.plesk.com/one-click-installer || wget -O - https://autoinstall.plesk.com/one-click-installer)
3. After entering the command, the latest stable Plesk version will be downloaded. This will be installed along with the standard components and features. In addition, all available patches and updates will be installed. The installation may take some time.
4. Afterwards, you can add or remove additional Plesk components if necessary.