Upgrade from 3.1.2 to 3.1.3
I've just got the email about the new version of ClassiPress.
The email shows “Upgrade from 3.0.5.x to 3.1” as a link to the guide, but the guide doesn't exists.
This forum shows a sticky post for old version upgrades.
I think would be wise to update what you call "lot of tutorials and helpful documents on our theme documents page" (as stated in your email message).