Note that Windows 10 appears to include the driver, as does Linux. One extremely edge case, though, to be aware of: As of this writing, the Linux driver for the CH340 does not support parity. The STM32Duino we sell requires parity when installing the bootloader. To save yourself hours of hair-pulling, know that you will either need to use a different USB to Serial adaptor, or a different OS, or patch your kernel driver.