The recommended way to get Invoke is to install the latest stable release via pip:
$ pip install invoke
We currently support Python 2.6/2.7 and Python 3.3+. Users still on Python 2.5 or older are urged to upgrade.
As long as you have a supported Python interpreter, there are no other dependencies. Invoke is pure-Python, and contains copies of its few dependencies within its source tree.
See this blog post for background on our decision to vendorize dependencies.
Development for details on source control checkouts / unstable versions.