Plone Upgrade 5 Failing - ComponentLookupError: (<InterfaceClass plone.registry.interfaces.IRegistry>, '') after upgrading from Plone 4 to Plone 5

5

probably you need to stop on version 4.0 and install plone.app.registry before upgrading to a newer version.

you will have to use the following pinning:

http://good-py.appspot.com/release/plone.app.registry/1.0b2?plone=4.0

if that does not works, I would suggest you to use another strategy to upgrade; Transmogrifier is your friend:

http://docs.plone.org/develop/import/index.html