If you already have Employee Portal 2 (6.0A) and want to upgrade to Employee Portal 3 (6.0B or higher), there are a few more items to consider:

They are separate installers that can be installed at the same time so you can technically support both Sage 300 companies that are on 6.0A and 6.0B (or 2014, 2016, 2017, 2018) at the same time.

The URLs will be different if you have both versions installed at the same time

Replacing version 2 with version 3 requires that you uninstall version 2 before installing version 3 as just running the new will leave both versions on the system. Otherwise the upgrade process can be used.