The evolve lite theme does not transit to evolve plus theme.
You need to manually install evolve plus theme and activate it.
evolve plus theme will use your evolve lite Theme Option settings.
You can refer to the section on “Installing Your Theme via WordPress” in the following documentation.
I see in this series of posts that I need to check the credentials in the theme update page to ensure that the new version can load.
This refers to the updating of evolve plus theme to a new version, not upgrading from evolve lite to evolve plus theme. Technically, there is no upgrading of evolve lite to evolve plus theme, it’s switching over to using evolve plus theme.