Hello Osata! You can use Apache and PHP-FPM to host multiple PHP web-applications, each using a different version of PHP, all on the same server, and all at the same time. For downloading the PHP versions, you can check the link below. https://www.php.net/downloads Also, running 2 PHP versions is possible on IIS. You may want to check the article below too. https://docs.microsoft.com/en-us/iis/application-frameworks/install-and-configure-php-on-iis/run-multiple-versions-of-php-on-iis