Intercepted curl error conditions and abort installation if return code != 0.

install-labmanager.sh

@@ -21,6 +21,11 @@ function downloadFiles {
     do
         echo -e "\n$i/${#files[@]} - $base_url/$f"
         curl -# --fail -O "$base_url/$f"
+        if [[ $? != 0 ]]
+        then
+            echo "curl exited with error code != 0, installation aborted."
+            exit 1
+        fi
         i=$(expr $i + 1)
     done
 }