I found a conditional check in a PHP file I inspected (I think in the Softaculous package, but I am looking at three things in two operating systems, so I may have forgotten).
It checked for several PHP versions ranging from 5.x thru perhaps 7.1 or 7.2.
I had installed XAMPP with PHP 7.4 compatibility based on a host server I need to keep in mind for future 'live' installation.
The checks for version followed specific install paths, and none were as high as PHP 7.4.