This page collects downloads for the Owl project including VM images and toolchain downloads.
The current VM release is 0.2. Be sure to download the correct version for the microcontroller you are using.
The current toolchain release is 0.2.1 for UNIX-like operating systems (including Linux and Mac OS X). It can be found on the Python Package Index:
You may also need the flash-vm scripts:
The Owl source code is published on GitHub at https://github.com/rice-systems/embeddedpython.