Nevermind my other post. I downloaded the StarCraft 1.15.3 Patch again through macgamefiles, and although it leads you to the exact same file on the exact same Blizzard FTP server, miracoulously it worked this time. Opened it, copied everything over, double-clicked StarCraft, tadaaa! The good times are back.
Find the patch for Brood War here, and the patch for StarCraft without Brood War here (is there even anybody out there who hasn’t got Brood War? StarCraft without Brood War is like pie without… uhm… cream? OK not a good reference. How about salad without dressing? Spaghetti without carbonara? Bread without jam? Man I’m getting hungry.)