The screen displayed a cold, hard error message: Device Driver Not Found.
| Software | Free option? | Notes | |----------|--------------|-------| | | Trial | Works with JK 721 via “Generic HPGL” | | VinylMaster Cut | Free (Lite) | Best free for JK 721 | | SignMaster | Trial | Chinese software – stable | | Inkscape + InkCut | Open source | Requires plugin, COM port config | Jk 721 Cutting Plotter Driver Windows 10