The starry CAS issue is only caused by not following the instructions and copy/pasting whole folders instead of individual .world files. I don't include unedited .world files in my uploads because some of them cause issues for mac users, so when you don't replace individual files, you get rid of the CAS "world" which causes it to appear starry or blank. If you repair your game and try again, it should be fine and having a pirated game shouldn't make a difference.