//no die if memory_limit is not detected or lower than 16M but display a big warn

install-dev/theme/view.css

@@ -260,6 +260,17 @@ div.field {
 	border:1px solid #ccc;
 }
 
+.warnBlock {
+	padding:14px 25px 14px 35px;
+	margin-bottom: 10px;
+	font-weight:normal;
+	font-size:13px;
+	line-height:18px;
+	background:#FEEFB3;
+	border:1px solid #9E6014;
+	color:#9E6014
+}
+
 .okBlock h1,
 .okBlock h2,
 .okBlock h3,

install-dev/theme/views/welcome.phtml

@@ -1,5 +1,9 @@
 <?php $this->displayTemplate('header') ?>
 
+<?php if (true): ?>
+	<div class="warnBlock"><?php echo $this->l('PrestaShop requires at least 16M of memory to run, please check the memory_limit directive in php.ini or contact your host provider'); ?></div>
+<?php endif; ?>
+
 <h2><?php echo $this->l('Welcome to the PrestaShop %s Installer.', _PS_INSTALL_VERSION_) ?></h2>
 <p><?php echo $this->l('The installation process should take only few minutes!') ?></p>
 <p><?php echo $this->l('If you need help, do not hesitate to check <a href="%1$s" target="_blank">our documentation</a> or to contact our support team: %2$s', $this->getDocumentationLink(), $this->getPhone()) ?></p>