I don't think you need vplay or pilote. If your adapter has a wii u/pc switch set it to wii u and follow https://wiki.dolphin-emu.org/index.php?title=How_to_use_the_Official_GameCube_Controller_Adapter_for_Wii_U_in_Dolphin.
If you want pc mode or are using the old two port install the driver from http://www.mayflash.com/Support/Download/
If you want pc mode or are using the old two port install the driver from http://www.mayflash.com/Support/Download/