We have versions of the CTT AddIn that will work for ArcGIS 10.0 and 10.1 (no 9.X versions are planned):
See the ReadMe page for installation instructions. Note that while the 10.1 version has not been tested in 10.2, 10.3, 10.4 or 10.5, but users report it working. Also, CTT is now incorporated into the CHaMP Topo Processing Tools.
There is a bug tracker available here.