From what i understand/have read in the past there are various different terms for this setup, installation and update topic:
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The “web setup” which was probably the “setup-owncloud.php” mentioned in Where ist the “setup-owncloud.php” file for version 10.0.6 (newest)? and which was removed according to Bye-bye web setup
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The “web installer/wizard” which is https://doc.owncloud.org/server/latest/admin_manual/installation/installation_wizard.html and which can be called by pointing your browser to the ownCloud URL after uploading the new ownCloud code.
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The “occ” command line installer which is https://doc.owncloud.org/server/latest/admin_manual/installation/command_line_installation.html
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The “web update” which is showing up if you point your browser to your ownCloud URL after you have uploaded the code of a new ownCloud version
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The “occ” command line update which is https://doc.owncloud.org/server/latest/admin_manual/maintenance/manual_upgrade.html#start-the-upgrade
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The “updater app” which is https://doc.owncloud.org/server/latest/admin_manual/maintenance/update.html
It seems to me this is a quite complex topic of various different terms. Personally i only had used points 2. and 5. and i’m happy so far with my installation.