Original .inf files may lack NTamd64 section. Add the following under [Manufacturer]:
[Manufacturer]
%MfgName% = RDAUSB, NTamd64
And under [RDAUSB.NTamd64]:
%USB\VID_18D1&PID_0001.DeviceDesc% = RDAUSB, USB\VID_18D1&PID_0001
Note: Replace VID/PID with actual device hardware ID from Device Manager → Details → Hardware Ids. coolsand rda usb driver 64-bit windows 10
Before proceeding, understand the obstacles: Original
After installation:
There is no single "official" website for Coolsand. You will need to download a third-party "All in One" or "Coolsand USB Driver" pack. And under [RDAUSB