We still work on some old Plone sites that need python2.4. I'm curious if anyone has successfully installed Python 2.4 on El Capitan, and how you did it. We have tried to install from source, from the installer, and using pyenv.
I am pretty sure https://github.com/collective/buildout.python works. Edit buildout.cfg to include the python versions you want.
Have you tried out the buildout.python checkout? You can configure the Python versions to be build in its buildout.cfg file (parts section).
-aj
I will try out buildout.python when I get the chance. Looks like that is what I needed!