The latest version id 5.0.377, so I assume that was a typo ?
Google chrome 'isn't included' in the download, but there is a question do you want to install it or not. If you either have it or don't want it just answer no. If you wanted it you had to answer yes, see image. Perhaps you didn't click the correct radio button.
avast 5.0 is in the google pack so there is a link to to see if you want chrome when you install avast 5.0.