I cannot update oxygen U.

I just got an problem on updating Oxygen u.

I tried reinstalling, and more.

It would say the following;

//Unhandled Exception: System.IO.IOException: The directory is not empty.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound, WIN32_FIND_DATA& data)
   at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
   at OXY_Installer.Program.Main(String[] args)