Technically there is no need for Drivers for the LG DVD Writer GP55ex70 on Windows going back to Windows 7. However, you may need to uninstall and reinstall the driver if it is no longer appearing Windows 10 after doing an update. Simply go to the device manager look for the DVD drive in the device tree, right click and delete the device, then scan for hardware changes, this should bring the device back up.
Also make sure the device, if it has never worked has enough power on the USB port. Sometimes when a tablet for example doesn't have enough amps it will not power up at all, or may just show a light indicator on the device and not much more.
There are plenty of sites that will take your money promising drivers for this device, but they are scams.