[Zope] Users sources for LoginManager

Hello Zopistas. Does anybody use LoginManager product in Zope v.2.1.6? I was looking around a bit but still can't understand how to use Generic User or Folder Persistent User Source? What difference is between Generic and Persistent sources? Also I'm wondered where can i get Zope 2.2 which is often mentioned in documentation. Thanks in advance. -- All my best, Sergey.