Just noted Typo in Upgrade script.
item C in upgrade from 3.0.x should read

c)Run UpdateFrom3.0.sql to remove the entries from the configuration file.
1) Login to your zen cart admin
2) Use Tools>Install SQL Patches
3) Copy the contents of UpdateFrom3.0.sql and paste into the text window
or
User the Browse button to load UpdateFrom3.0.sql into zen cart.