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+RSS-Bridge does no longer support PHP 5.4 (see [Requirements](Requirements)), but can be made compatible to run on PHP 5.4 installations. The following script provides an automated way to downgrade the sources.
+
+Be aware that this script may stop working on any release without notice. This script may or may not be updated in the future. It is known to work on commit [2fd60c68b083f43068703cab87c5e72a8eacc1c4](https://github.com/RSS-Bridge/rss-bridge/commit/2fd60c68b083f43068703cab87c5e72a8eacc1c4).
+
+Place the following content in a file called **downgrade.sh** in the **root folder of your RSS-Bridge installation**:
+
+```
+#!/bin/bash
+# downgrade.sh
+echo "Downgrade RSS-Bridge to PHP 5.4.0"
+
+# index.php
+sed -i  's/5.6.0/5.4.0/g' ./index.php
+
+# html.php
+sed -i  's/$bridgeClass::PARAMETERS/$bridgeClass::$PARAMETERS/g' ./lib/html.php
+
+# BridgeAbstract.php
+sed -i  's/const PARAMETERS/public static $PARAMETERS/g' ./lib/BridgeAbstract.php
+sed -i  's/static::PARAMETERS/static::$PARAMETERS/g' ./lib/BridgeAbstract.php
+sed -i  's/self::PARAMETERS/self::$PARAMETERS/g' ./lib/BridgeAbstract.php
+
+# Bridges
+for f in ./bridges/*.php
+do
+	sed -i  's/const PARAMETERS/public static $PARAMETERS/g' "$f"
+	sed -i  's/static::PARAMETERS/static::$PARAMETERS/g' "$f"
+	sed -i  's/self::PARAMETERS/self::$PARAMETERS/g' "$f"
+	sed -i  's/(empty($this/(!($this/g' "$f"
+	sed -i  's/(!empty($this/(($this/g' "$f"
+done
+```
+
+run the following commands in your SSH terminal:
+
+```
+# chmod +x ./downgrade.sh
+# ./downgrade.sh
+```
+
+Now RSS-Bridge will work on PHP 5.4