Ref. post: http://stephenjude.tech/articles/upgrading-to-php-74
Note: You can even add #PHP 8 with a few adjustments: https://forum.laragon.org/topic/2250/don-t-support-php8/4
With Laragon, adding another PHP version is very easy. Here's how to add PHP 7.4Download PHP:
In this case we download:
Very easy huh. That's all!
Please be noticed about PHP Version (so you can add new extensions properly)x64 means 64-bit x86 means 32-bit nts means Non Thread Safe
If something's wrong, please check and install correspond VC Redist (VC11, VC14, VC15...)