u/GLPPhotography

Last night i tried getting photos of the M51 with my R7 and canon 70-200 f2.8 ( google recommended that over my sigma 150-600) and the photos have seemed alright until i got to the process of stacking them. I have no experience on astrophotography so I'm constantly using Google on how to do it which it has recommended me to use DeepSkyStacker cuz it is free. I'm trying to use it and it will process the photos for about 20 minutes and then say that it can only stack one photo or it will say it can scan 2000 stars or 20, google has been useless and when i tried sorting it myself, the photo came out green and the exact same as the raw files. Are there any ways to fix this or are there any other alternatives which i can use. Thanks