After giving XXYY/install.php,
PHP and Filepermitions are ok.
I can see
Webserver Configuration - All Requirements Pass but 2 Warnings
- Server software Unknown web server
- URL rewriting support You need mod_rewrite to use friendly URLs with SilverStripe, but it is not enabled.
Note that in 2.4.2 the installer now detects your web server, or rather tries harder to detect your web server, but there could be cases where PHP is just not given enough information about the environment it is running in.
Have you tried to install SilverStripe anyway? These are just warnings, and won't stop you from actually installing.