Before we dive into the driver installation, let's quickly discuss what an EPUB file is. EPUB (Electronic Publication) is a file format used for digital publications, such as eBooks. In this case, the .epub file contains the driver for your card reader.
Ensure it is plugged into a USB 2.0 header. If it's connected to an older 1.1 header, speeds will be capped at 12 Mbps.