Huh... strange. I tested them both by downloading them back on my computer (both the old and latest version). Everything ran smoothly and UnityPlayer.dll was in its rightful place. By any chance, how exactly did you extract the package? Did you only extract the .exe file or only some items? Did everything get mixed up with other items in the same folder and you might have deleted what looked like garbage files? Did you even extract the .zip file? Every file in the package counts (except that readme text). Be sure to extract EVERYTHING from the same zip package onto an empty folder (empty at best, to avoid confusion, and respect the pre-existing folder-file hierarchy- if a file is in a folder, it's gotta stay in that folder.). Don't just extract the game's main executable or Data folder. And you can't run a Unity game from the .zip file, many files work together simultaneously to run the game they're part of.