Python 2.7.15 Windows MSI removes previous 2.7.x binaries?

[phennings at gmail.com]

I downloaded the 64-bit Windows MSI for Python 2.7.15 and upon finishing the installation, I noted that prior Python installs had effectively been removed, only leaving a Lib and Scripts folder in the directory to which said prior version had been installed.  For what it's worth, it appears this is only true if I install for 'All users' rather than for 'just this user'.

I can't find anything in the release notes, docs or on this mailing list that describes the motivation for doing this.  I personally find that having multiple versions installed on Windows is very helpful for being able to target distribution version for the purposes of constructing virtualenvs.

Can anyone say whether this is intended behavior?