Topaz Studio 3.02 has just been launched and it's a free download if 12 month upgrage period (or longer) is still valid.
I made a quick testshot since we have finally one clear night here. At least it does pretty good job at selecting stars from the noise.
2000x1500 crop from a 20MP original RAW. ISO1600, No denoise
View attachment 879906
2000*1500 Crop from same RAW file denoised with Topaz (and cropped with Darktable)
View attachment 879907
Original 20MP RAW file denoised with Topaz
View attachment 879908