#2 — 1.6 requires Plone 4, no 1.5 at pypi

When trying to include Products.PloneSoftwareCenter in a buildout, buildout complains that:

Error: There is a version conflict.
We already have: Plone 3.3.3
but Products.ArchAddOn 1.6 requires 'Plone>=4.0dev'.

ArchAddOn's setup.py says:

      install_requires=[
          'setuptools',
          'Plone>=4.0dev',
      ],

...but the pypi documentation says:

"Plone 4 compatible release." about ArchAddOn 1.6

I am unable to locate any download link for 1.5. Buildout does not find it and I cannot find any link at:
http://pypi.python.org/simple/Products.ArchAddOn/

for any 1.5 version