Kodak sold its imaging software division to years ago. DxO currently offers DxO Nik Collection (which includes Silver Efex and Color Efex). While it isn't exactly GEM Airbrush, the "Dfine" module for noise reduction and "Tonal Contrast" achieves the same skin-smoothing logic using Kodak's original patents.
To use the full version of the software and remove the "watermark" applied during the trial period, a legitimate or serial number is required. kodak digital gem airbrush professional 2.0 key
Here is the truth: because Kodak no longer supports the software, the concept of a "key" is obsolete for legitimate use. However, you have three alternatives to achieve the same result. Kodak sold its imaging software division to years ago