After 10.2.1 update Arcpy 64 bit ERROR

[JA4]

I've updated my ArcGIS desktop version from 10.2 to 10.2.1 and have noticed that when I run the 64 bit version of IDLE I now get an error when trying to import arcpy:

Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.

>>> import arcpy

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    import arcpy
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\__init__.py", line 24, in <module>
    from arcpy.toolbox import *
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\toolbox.py", line 656, in <module>
    from na import AddFieldToAnalysisLayer as AddFieldToAnalysisLayer_na
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\na.py", line 26, in <module>
    import _na
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\_na.py", line 46, in <module>
    class StreetDirectionsProperties(na.StreetDirectionsProperties):
AttributeError: 'module' object has no attribute 'StreetDirectionsProperties'

So the error seems to come from failing to find a module for the Network Analyst extension, which I see is listed as one of the updated Python features in 10.2.1: (http://resources.arcgis.com/en/help/main/10.2/#/What_s_new_in_ArcGIS_10_2_1/016w0000005v000000/). I'm guessing the 10.2.1 release didn't update both the 32 AND 64 bit versions of Arcpy when installing Python 2.7.5. The version I still have in C:\Python27\ArcGISx6410.2 is 2.7.3, but this seems to now be in conflict with the new install.

Can someone please help me figure out how to correct this issue with IDLE? I really need to be able to run stand-alone 64 bit Arcpy scripts. I'm aware of 64 bit background geoprocessing in ArcMap/ArcCatalog, but this is different. I run heavy lifting stand-alone scripts that must be in the 64 bit version.

Thank you

[MathewCoyle]

You are correct you need Python 2.7.5 with ArcGIS 10.2.1. Have you tried installing the 64-bit upgrade for 10.2.1?

[JA4]

You are correct you need Python 2.7.5 with ArcGIS 10.2.1. Have you tried installing the 64-bit upgrade for 10.2.1?

Do you mean the ESRI specific Python library or Python 2.7.5 from the Python.org website? I have tried installing 2.7.5 64 bit version from Python.org and that didn't fix it.
Is there a downloadable update to the 64 bit background geoprocessing package for 10.2.1 available from ESRI?

[MathewCoyle]

You need to installed the 64-bit GP upgrade from Esri. From the sounds of what you've done on your environment I would uninstall everything and start from scratch.