There are no detailed steps about upgrading to the latest OJS versions on a live server? Where can i get a step-by-step guide to be sure nothing is broken after the upgrade
Do not do upgrade onn production version of system. Please firstly check on copy of the system on the server and after that make backup and try upgrade.
And I agree with @vvucic to try first on test environment or create a copy of the production and perform upgrade there and if succesful just reroute DNS.