Here are the ready to use environments. You can find some videos at Videos.
Other platforms are supported but I do not have access to them. Contact me if you want me to explain how to create a new working environment.
I'm currently migrating the second microworld that was initially planned to be described in the book to the newest release of BotsInc. Here is an image that you can use with the environment above (just drop the .image file on the squeak executable). Pay attention that this is an old version (prior to the distribution 02-2005 below.
Here is the old image that works on any platforms.
Here is the old chapters (that do not have been proofread). I hope to find some money to ask a professional to proofread them. For now they are given for free as they are. I plan to give them for free in the future too.
Here are the solutions of the exercises