lomMirror is a module for Zope.
You can download Zope from Zope.org.

You will have the following files in "lomMirror" directory by "tar xvfz lommirror.tar.gz".

To install lomMirror into Zope, you copy the whole lomMirror directory under zope's l$(ZOPE)/lib/python/Products/ directory.
For example, in debian's standard package, it will be /usr/lib/zope/lib/python/Products/lomMirror.

Then you can restart Zope server and then will have a "lomMirror" item at "add..." list in Zope's management page.

Have fun!