Press Spacebar on the downloaded .qlplugin file.Click the “Install” button in the popup window.After making mistakes.In QuickLook.Exception.log file,it says "The end of the stack trace at the previous position where the exception was thrown" "In System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()" "In System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)" "In VersOne.Epub.EpubReader.d__8.MoveNext()",