Alternatively, you can install them at the system-wide plugin location:
$ sudo ./setup.py install
Get the sources with command: bzr branch lp:bzr-scmproj scmproj
For python-based version of bzr: run setup.py script from sources:
python setup.py install
For standalone bzr.exe version: copy entire directory 'scmproj' to plugins directory where Bazaar installed, e.g. C:\Program Files\Bazaar\plugins
You can check whether it's successfully installed by doing:
bzr plugins
and looking for 'scmproj' entry in the output.
If you want to ensure it is actually working you could run tests:
bzr selftest scmproj