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Basically a camera records a pixel in a photo from four sensors with colour filters on them (1x red, 2x green, 1x blue typically), so there is more green being recorded in raw by the chip as the green typically is the more sensistive of the threethe camera processes these four colour values to produce "one colour pixel" in your camera image. This filter is a bayer matrix and usually the four sensor are arranged in a square pattern to make one pixel. The pattern is usually something like RG/GB in a square so the two greens are in opposite corners. There is no standard bayer pattern for all cameras. The four sensors (or subpixels ) each capture at full bit range of the camera sensor, often 12 or 14 bit per pixel these days and the data combined to produce a 12 or 14bit value for that one pixel. and then stored in the raw file or to a 16bit container format. So this means colour cameras are loosing some data due to the bayer matrix when taking regular photos and because twice as much green filtered data is recorded when processing astrophotography you are stretching data a lot so the green colour cast comes forth because its half the data.
As an aside a monochrome camera does not have a bayer matrix so you can get all four sensors recording directly as pixels or used in producing a pixel without discarding any. Which is why they can produce much more detailed and sensitive signal data.
So in your case if the software doesn't have your camera listed, you can try to find online information about the bayer matrix used for your camera and some listed in the software and try to find a match, if you can find the sensor model in your camera and another camera using the same sensor (not merely brand like canon or sony but actual model) and give that a try. Also try searching for your processing software and green cast as most have a tool for removing the green cast for this very reason.
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