Upgrade existing sandbox.

Upload zipped 157c fileset to server root.
Delete existing admin & includes folders from server to ensure unnecessary files are not present after install.
Unzip 157c files

Run zc_install
Database detected. No option to upgrade.
Only option is to perform a "Clean Install" and delete the database contents.
Is this expected and considered normal? If so, I can complete the install and then drop all the new db tables and restore a 156c backup and rerun zc_install.

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