I found the issue https://github.com/pypa/pip/issues/3028 And just for the record. (control) N:\zope\control>Scripts\pip.exe -V pip 8.1.2 from n:\zope\control\lib\site-packages (python 2.7) (control-emisiones3) N:\zope\control>Scripts\pip.exe list AccessControl (2.13.13) Acquisition (2.13.9) DateTime (2.12.8) DocumentTemplate (2.13.2) docutils (0.12) ExtensionClass (2.13.2) initgroups (2.13.0) Jinja2 (2.7.3) MarkupSafe (0.23) mechanize (0.2.5) Missing (2.13.1) mr.developer (1.33) MultiMapping (2.13.0) nt-svcutils (2.13.0) Paste (1.7.5.1) PasteDeploy (1.3.4) PasteScript (1.7.5) Persistence (2.13.2) pip (8.1.2) Products.BTreeFolder2 (2.13.5) Products.ExternalMethod (2.13.1) Products.MailHost (2.13.2) Products.MIMETools (2.13.0) Products.OFSP (2.13.2) Products.PythonScripts (2.13.2) Products.StandardCacheManagers (2.13.1) Products.ZCatalog (2.13.27) Products.ZCTextIndex (2.13.5) Pygments (2.0.2) pytz (2015.4) Record (2.13.0) repoze.retry (1.2) repoze.tm2 (1.0) repoze.who (2.0) RestrictedPython (3.6.0) setuptools (18.0.1) Sphinx (1.0.8) tempstorage (2.12.2) transaction (1.1.1) wheel (0.29.0) z3c.checkversions (0.5) zc.buildout (2.3.1) zc.lockfile (1.0.2) zc.recipe.egg (2.0.3) zc.recipe.testrunner (1.2.1) ZConfig (2.9.3) zdaemon (2.0.7) zExceptions (2.13.0) zLOG (2.11.2) ZODB3 (3.10.5) zope.annotation (3.5.0) zope.broken (3.6.0) zope.browser (1.3) zope.browsermenu (3.9.1) zope.browserpage (3.12.2) zope.browserresource (3.10.3) zope.component (3.9.5) zope.configuration (3.7.4) zope.container (3.11.2) zope.contentprovider (3.7.2) zope.contenttype (3.5.5) zope.deferredimport (3.5.3) zope.dottedname (3.4.6) zope.event (3.5.2) zope.exceptions (3.6.2) zope.filerepresentation (3.6.1) zope.i18n (3.7.4) zope.i18nmessageid (3.5.3) zope.interface (3.6.7) zope.lifecycleevent (3.6.2) zope.location (3.9.1) zope.pagetemplate (3.5.2) zope.processlifetime (1.0) zope.proxy (3.6.1) zope.ptresource (3.9.0) zope.publisher (3.12.6) zope.schema (3.7.1) zope.security (3.7.4) zope.sendmail (3.7.5) zope.sequencesort (3.4.0) zope.site (3.9.2) zope.size (3.4.1) zope.structuredtext (3.5.1) zope.tal (3.5.2) zope.tales (3.5.3) zope.testbrowser (3.11.1) zope.testing (3.9.7) zope.traversing (3.13.2) zope.viewlet (3.7.2) Zope2 (2.13.23) ZopeUndo (2.12.0) -- ________________________________________ Lo bueno de vivir un dia mas es saber que nos queda un dia menos de vida