While nothing should ever be checked in on a tag directly,

2.8b2 was already released for non-Windows, but contains an
incorrect Zope version number in the Windows buildout.  Since
a Windows installer was never released for 2.8b2 (I'm trying
to do that now), there's no way to build one from the 2.8b2
tag without changing this part of its Windows buildout first.

inst/WinBuilders/mk/zope.mk

@@ -3,7 +3,7 @@ ZOPE_REQUIRED_FILES=tmp/$(ZOPEDIRNAME).tgz
 REQUIRED_FILES=$(PYTHON_REQUIRED_FILES)\
                $(ZOPE_REQUIRED_FILES)
 
-ZOPEVERSION=2.8.0-b1
+ZOPEVERSION=2.8.0-b2
 ZOPEDIRNAME=Zope-$(ZOPEVERSION)
 
 MAKEZOPE="$(MAKEFILEDIR)/bin/makezope.bat" "$(WIN_BUILD_DIR)"