You may come across an issue while installing Prestashop via Softaculous regarding not picking up correct php version.
The error would look similar to the error below -
The following errors were found : Required PHP version greater than equal to 5.4.0 AND found version is : 5.3.29
1. Modify the file where softaculous is installed on the server -/usr/local/cpanel/whostmgr/docroot/cgi/softaculous/enduser/hooks/pre_install.php
2. Make a copy of pre_install.php file before you make any changes.
3. Now, add below code and replace $version = phpversion(); with $version = 5.6;
global $soft, $software, $globals;
// Your Code to Identify the PHP version
$version = phpversion();
Give a try to re-install prestashop via Softaculous and this should work for you.