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Should I install 4.5.2 in the Joomla 3 site before doing the upgrade to Joomla 4/
Is it possible to store the images above root to avoid duplication if I create a parallel Joomla 4 site on my server for development?

Hi,

Should I install 4.5.2 in the Joomla 3 site before doing the upgrade to Joomla 4/

No!
Follow all steps of this migration guide:
https://www.phoca.cz/documents/50-jooml ... o-joomla-4

Kind regards,
Benno