Good news, your camera is supported by SILKYPIX  SILKYPIX 9.0.4 / SILKYPIX 8.1.27.

Nikon Z6 Features

• 24.5MP FX-Format BSI CMOS Sensor
• EXPEED 6 Image Processing Engine
• UHD 4K30 Video; N-Log & 10-Bit HDMI Out
• 273-Point Phase-Detect AF System
• Built-In 5-Axis Vibration Reduction
• 0.80x 3.6m-Dot EVF with NIKKOR Optics
• 3.2" 2.1m-Dot Tilting Touchscreen LCD
• 12 fps Shooting; ISO 100-51200
• CFexpress Type B/XQD Memory Card Slot
• NIKKOR Z 24-70mm f/4 S Lens

 

RAW Conversion &  Nikon Z6

SILKYPIX DS 9 and SILKYPIX DS Pro 9 added support for this camera on November 29, 2018.