- It is probably a good idea to use the Site administration block>Server>Maintenance mode to prevent user activity as the site upgrades.
- Having moved your old Moodle software program files to another location, unzip or unpack the upgrade file so that all new the Moodle software program files are in the location the old files used to be in on the server. Moodle will adjust SQL and moodledata if it needs to in the upgrade.
- Copy your old config.php file back to the new Moodle directory.
What does the highlighted part means
Should I delete the old moodle file form the server then copy the new vesion
Or can I overwrite the old moodle file with the new version