You have to deploy the Vtiger patch named MagentoConnector.zip into the Magento source. The patch is available
here.
Follow these steps to install the Vtiger patch in Magento:
- Download the MagentoConnector.zip patch.
- Go to Magento source.
- Extract the contents of the zip folder.
- Log in to the admin panel in Magento.
- Clear the Magento cache.