1. Software for printer.
Cura 4.6 is latest Cura with adding Wanhao printers.

Cura 18.061 is older Cura with old interface. If you like old style, you can download this edition.
Cura 18.061 download
Cura 4.7.1 and up is newest software which is too new to embed Wanhao printer. Therefore we need to add the D12 manually.
Cura 4.7.1 download
Instruction on adding D12
MKSPlugin042802
filament setting
2. Flashing Firmware for D12
D12/230
D12/300
D12/400
D12/500
Instructoin
Video Guidance
2.1 If you want to add BL touch onto your D12/230 or D12/300, please flash the following firmware.
D12/230BL
D12/300BL
Instructoin
Video Guidance
Video guidance
Installation manual(hardware)
3. Simplify 3D configuration.
D12-230 FFF