the old script Table To Subtype on arcscripts works with 10.4 and previous versions if you alter the py-script: the path to ArcToolbox has to match to your installation / desktop version
line 21 import sys, arcgisscripting, os
line 32 gp.AddToolbox("C:/Program Files (x86)/ArcGIS/Desktop10.4/ArcToolbox/Toolboxes/Data Management Tools.tbx")
Gregor