[Zope] install CMFDocMgt

[Chy Ty]

Dear Sir
I am using Zope 2.6, now I want to install CMFDocMgt but it does not work,
it has an erro like this when I start the Zope

2003-12-19T16:01:52 ERROR(200) Zope Could not import Products.CMFDocMgt
Traceback (innermost last):
  Module OFS.Application, line 541, in import_product
  Module Products.CMFDocMgt, line 9, in ?
  Module Products.CMFDocMgt.config, line 3, in ?
ImportError: No module named Archetypes.public
Coul you tell me how to install CMFDocMgt, I also install RevisionManager
Product.