Remove Powered By Phoca Download Footer Link

Though you should give credit to the developer in all aspects. Still if it is very much required, follow the steps.

Step 1: Open following file:

administrator\components\com_phocadownload\helpers\phocadownload.php

Step 2: Find and replace following code: 

public function getF() {
 return '';
 }

I have tested with Phoca Download 2.1.9 version for Joomla 2.5.x