How To Disable Magento Extensions
If you’ve ever tried to disable an extension via the System>Configuration>Advanced section of your Magento admin, you’ll know that this doesn’t actually really work! To fully disable an extension you’ll need to edit the XML configuration file of the extension itself.
Go to extension configuration files in the app/etc/ directory, find the extension you want to disable and then edit the file. Set the active parametar to false like this: