If your Trac instance was installed through an operating system package
manager or an installer on Windows, proceed with ... 7. Steps specific to a given
Trac version. Upgrading from Trac 1.2 to 1.4. Python 2.6 no longer supported.
Upgrade Python to 2.7, but not 3.0 or greater. .... To enable the svn support, you
need to make sure the tracopt.versioncontrol.svn components are enabled, for
example by ...