instructions for installing zope are very clear on their website,
bin/easy_install -i http://download.zope.org/Zope2/index/<Zope version> Zope2
but what to insert in <zope version>, here comes the problem. I tried many probables like
bin/easy_install -i http://download.zope.org/Zope2/index/2.13 Zope2
bin/easy_install -i http://download.zope.org/Zope2/index/Zope2-13 Zope
and many, it was giving errors that I am not able to understand or fix. But with my commonsense I understood I m entering the version number wrong :p. I googled the error, as usual it showed up many results but none was useful.
Then I carefully observed the url and got the key.
open your browser and open
find the required version number you want to install and enter the same in <zope version>
bin/easy_install -i http://download.zope.org/Zope2/index/2.13.9 Zope2
That is it.