Hey guys, suffering from the same issue, too. today I purchased macbook pro i7 16GB 512 SSD; after starting it with my apple id; on the desktop found a new release of macos big sur as an update. I did required steps however it’s been going on for almost 9 hours and not completed. It once showed: 12,18 GB / 12,18 GB with an un-filled blue line in the dowloading statues bar; with an inconsistency that the download seems to be completed in numbers and yet the line has not hit the finishing point. Suffering from the first hours of my brand-new mac has not been a good experience. Hope someone would help and let me enjoy this device asap. thanks in advance.