Download twisted module from -
http://twistedmatrix.com/trac/wiki/Downloads
Download setuptools for python -
http://pypi.python.org/packages/2.6/s/setuptools/setuptools-0.6c11.win32-py2.6.exe#md5=1509752c3c2e64b5d0f9589aafe053dc
Once you downloaded the zope interface egg file, you can install it as follows -
c:python26scripts> easy_install.exe zope.interface-3.6.1-py2.6-win32.egg
