The USB Network Native Driver Fling is a popular driver for ESXi to allow the usage of USB-based Network cards. When you downloadaing the driver, you might notice that there are separate versions for each ESXi Update release (eg. 8.0 and 8.0U1). Both versions are only compatible with their corresponding ESXi version, which makes direct updates a little bit more complex.
This article explains two options to upgrade ESXi hosts with USB-based network adapters.