0.9.12 available at pypi
launchpad jumps to 0.10 after 0.9.10 with no mention of .11 or .12
github indicates 0.9.11
the official documentation does talk about but doesn't provide links for download for 0.9.12.
Graphite uses semantic versioning.
0.9.x is the "Current Stable Release" branch and 0.10.x is the "Active Development" branch (as indicated by the launchpad page). If you're looking for the most pain-free version you should work with the latest version on the stable release branch, currently 0.9.12, available from github and pypi.