The process of downloading the A4tech Optical Mouse: 4D driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the A4tech Optical Mouse: 4D driver from the primary server - this is the manufacturer’s A4Tech official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the A4tech Optical Mouse: 4D diver.