Can I slipstream already downloaded Update 1 files (KB2919442, KB2919355, KB2932046, KB2937592, KB2938439, KB2934018) into the Windows 8.1 Enterprise x64 ISO using Win Toolkit v1.4.43? Does Win Toolkit v1.4.43 requires WADK and will download separately? Is it portable or need to be installed in the system before use?