I have an a630, and am trying to get CHDK on it so that I can shoot in the raw format. I downloaded the proper files, but when I copied them onto my SD and put them in the camera, nothing happened. I went to the mac support page, and it said it was because the files were flagged. I tried downloading both of the decompressors listed on the page, both said that they could not open the file. I then tried to use terminal, but when I put in the command, it said that those files did not exist. I dont know what to try next.