What does/did Advanced Shipper do? I do not see it in the plugins?
Since it was a commercial module, it was not allowed to have a support thread. It was/is a comprehensive shipping solution that offered all and more than the core Zen Cart options, in one package. Highly recommended. I got it from day one as ZC could not do what I needed.
You can get it from ceon.net, and is well worth the cost in my opinion.