I don’t know why AD is so complicated to explain how to upgrade a “fresh” installation of 4.0.1 to 4.0.2.
First, verify to have the last POSTGRESQL version: 9.0.1.
Look in the “SERVICES.MSC” or execute the sql query:
Then download the “Upgrade_ZIP” file and run:
(You can’t use “Copy Previous Case” because the upgrade don’t change the DB. If you want to use the new futures: just re-process all).