Also, I remember, installing PHP through WPI will add to server level, you may have installed PHP 7.2 using WPI prior to setup website. anything added AFTER IIS setup will automatically inherit from server level, anything added later, you have to select correct PHP version at site level as well and this would be happening, you after installing PHP 7.4 assumed it should work straight away at site level as well, this does not happen automatically, you have to make changes at site level as well.
Installing and upgrading help
Upgrading from 3.63 to 3.10 Error 500
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