Below is an example composer.json file to use in your project.
Replace:
url=https://example.com
with the URL of your site;license_key=xxxxx
by your own (just the xxxxx);version=8.6
: version number such as 8.6;lang=EN
: EN, FR or ES depending on the site where you have purchased the PRO version.
Then run the following command in a terminal:
composer require wp-seopress-pro/wp-seopress-pro