I compiled stc8prog with Cygwin64 but the software can not open the COM port on Windows. I tried both way and it doesn't work. The MinGW version that I managed to compile also doesn't connect.
Tested on ARM-DAPLink and a genuine FT2232. Both of them don't work.
Honoka@Honoka ~/stc8prog
$ ./stc8prog.exe -p /dev/ttyS15
Opening port /dev/ttyS15: can not open port
Honoka@Honoka ~/stc8prog
$ ./stc8prog.exe -p COM16
Opening port COM16: can not open port