eCommerce module

I am using an older book, which is based on eCommerce 3.4 on Drupal 5, and I am using eCommerce 4.3 on Drupal 6.2.

One of the things the book suggests is using this Auto-Creating User Accounts module, but it was not included in the version of eCommerce I have.

Was this capability brought into the 4.3 version of eCommerce in some other format? If so, where would I go to configure it?

Thank you all for your help so far!