Web
Preparation
Download the new files from GmodStore.
Take a look at config.php to see if new settings have been introduced since the last update. If so, copy the new settings into your existing config.php file.
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For large instances it's recommended to enter maintenance mode prior to uploading the new files and to perform database migrations manually using the CLI afterwards.
WARNING
Game server integrations and modules should be updated (if updates are available) along with the web instance to ensure compatibility.
Updating from the previous release
If you're exactly one version behind, navigate to the the update directory and upload the contents of the contained web directory to your web server.
WARNING
The update directory must not be used if you're not running the very previous release.
Updating from an older release
Removing the old files
To ensure a clean update remove any unmodified files from previous installations.
config.php, modules and storage should be retained.
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The vendor directory can be left as is unless backend dependencies have been updated.
Applying the update
Upload the new files to your web server.
Navigate to your web instance with a browser and proceed with the updater.
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Alternatively run the database migrations using the CLI.