Earlier chapters of this book instruct readers to run install-package commands to update the project with the sample code referred to in the text.

Chapter 8 refers to running or viewing code samples such as:
MvcMusicStore.C08.ActionLink
MvcMusicStore.C08.AjaxForm
MvcMusicStore.C08.CustomClientValidation
MvcMusicStore.C08.Autocomplete
MvcMusicStore.C08.Templates.

The download source code contains only MvcMusicStore.C08.AjaxForm
for chapter 8.

How are the other referred to code samples obtained?

Stephen,

Really sorry about that, it looks like those code samples didn't get uploaded correctly. I resubmitted them and hope they'll be up soon. In the meantime, I've uploaded them temporarily to my OneDrive: http://1drv.ms/1BFrIDZ

Jon