https://docs.zen-cart.com/user/upgra...er_no_upgrade/
Brief recap of the step by step instructions in the upgrade docs
https://docs.zen-cart.com/user/upgrading/
- In the "new" store's /includes/configure.php file there are some DB_XXXXXX settings.
- The DB_DATABASE must be the NEW database
- The DB_PREFIX must match whatever was in the "old" store's /includes/configure.php file
- Then you make a backup of the "old" store's database
- And import that backup of the "old" database into the "new" database, replacing the tables previously in the "new" database from the temporary new install you did.
- Then running zc_install on the "new" store will give you the Upgrade Database option.
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