Where to get PHP 5.6.20 for Windows?

My WP site was recently hacked, so I want to upgrade. It’s running on Windows Server 2008. The WP upgrade page tells me that “WordPress 5.4.1 requires PHP version 5.6.20 or higher. You are running version 5.4.24”.
The only PHP release that I can find for Windows is v7.*. I have installed v7.4.6, but my WP site returns an error with that release.
Can anyone direct me to a download site which had older PHP versions for Windows – specifically v5.6.20?

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