The reason is simple: Microsoft updated the driver signing requirements for 64-bit versions of Windows 10. The original drivers that shipped with the Gigaware adapter (typically based on the or less commonly, a Silicon Labs CP210x chipset) are outdated, unsigned, or incompatible.
| Chipset | Driver Status on Win10 64-bit | |--------|-------------------------------| | | Requires specific legacy driver (v3.3.2 or v3.3.5) – recent Windows updates may reject it. | | Prolific PL-2303 (HXD, HXE, HX) | Works with latest official driver from Prolific. | | Silicon Labs CP210x | Works flawlessly with official driver. | | FTDI FT232 | Works flawlessly with official driver (rare in Gigaware). | gigaware usb to serial driver windows 10 64 bit
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