Squeak is released underSqueak-L. It is a very free license, though it does require you to share any modifications you make to the VM or the base classes. The license allows you to be your ownOfficialSupport.
ThePackage Universes distributions include a number of packages pre-tested for the release and ready to install. They are a good basis for software development if you do not need bleeding-edge development versions of Squeak.
Errata
The list of known bugs and outstanding issues with the current stable/b release can be found atSqueak Errata.
What You Need
At a bare minimum, you need the following files to run Squeak:
A portableimagefile, containing a snapshot of Squeak
Download sites vary in how they package these files; often, you will have to download platform-independent and platform-dependent files separately.
Notes:
Virtual machines and Squeak images are generally compatible up to major version changes. So a 3.4 and 2.8 VM and image will not work together, but 3.2 and 3.5 will.
If you are using an alpha release, you can download the very latest patches without waiting for the ftp sites to update; see:Code updates.