Download from here:
https://www.graxpert.com/
GraXpert is an astronomical image processing program for extracting and removing gradients in the background of your astrophotos. We provide several methods traditional interpolation methods such as Radial Basis Functions (RBF), Splines and Kriging which require the user to manually select sample points in the background of the image. Our newest addition is an AI method which does not require any user input.
GraXpert is free, a standalone package and now includes denoising.
Graeme