Need to understand, how to upgrade confluence server 6.3.3 to the latest.
Currently we are in trial license, we are expecting the support to the latest version.
Please, start from
https://confluence.atlassian.com/doc/upgrading-confluence-4578.html
and read the upgrade notes.
https://confluence.atlassian.com/doc/confluence-7-4-upgrade-notes-994312202.html
As usual start from test env and then enroll on production environment after successful upgrade on test
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