diff --git a/public/install.php b/public/install.php
index 2d6c405..0e6de00 100644
--- a/public/install.php
+++ b/public/install.php
@@ -136,6 +136,14 @@ class BlueTwilightInstaller
 
     private function fetchComposerSignature()
     {
+        if (!boolval(ini_get('allow_url_fopen')))
+        {
+            $this->echoError('allow_url_fopen is disabled so we cannot use Composer');
+            echo '<br/>';
+            $this->echoError('You will need to install the vendor libraries manually - <a href="https://github.com/pandy06269/blue-twilight/wiki/Install-Vendor-libraries-manually" target="_blank">see this page for more details</a>');
+            return false;
+        }
+
         $signatureUrl = 'https://composer.github.io/installer.sig';
         $this->composerSignature = trim(file_get_contents($signatureUrl));
         if (strlen($this->composerSignature) == 0)