In order to remain lightweight, Anchor only supports recent versions of the languages it’s written in. As such, you will need:

If you’re not sure what version of PHP you have, create a new file, and paste the following in at the top of the page:

<?php echo PHP_VERSION; // version.php

This should print a number to your screen, which should be bigger than 5.3.6.

If you don’t have the necessary requirements, you will not be able to install Anchor. Contact your host to upgrade.