V8 and V9 run off completely different CSS frameworks, so there is no ‘update’ since it’s not possible to go through all the old child themes and re-do them.
WordPress database content has always remained the same, so this will be not be affected when doing updates.
The easiest way to start using V9 is to simply login to the WP admin -> themes -> upload and activate the new theme.
Then under the theme configuration -> save the settings page.
Be-aware you’ll need to use a new design.
NOTE. I strongly recommend you backup your website first.
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