All the drivers are normally installed directly from the dongle itself when it is plugged into the USB port. It sounds as if the driver is not actually missing but corrupt maybe. I would go into device manager and delete any device that is associated with the Huawei dongle. Then reboot and try re-inserting the dongle. Leave it quite a while as they usually install a couple of drivers quite quickly and then a whole lot more after a longer period of waiting.
OnePlus 5 review