Your SQL Server DB is already updated but FileVista.config is not. If you have the copy of FileVista.config that was updated on the new server when you first ran the update.aspx, then copy that file to the old server.
If you don't have a copy of the updated FileVista.config, then you can manually change the file to match this new format:
<?xml version="1.0" encoding="utf-8"?>
<FileVistaConfiguration>
<DbProvider>System.Data.SqlClient</DbProvider>
<DbConnectionString>Copy the corresponding value from old file here</DbConnectionString>
<DbSchemaVersion>7.3.6</DbSchemaVersion>
<AuthenticationKey>Copy the corresponding value from old file here</AuthenticationKey>
<RecoveryModeEnabled>false</RecoveryModeEnabled>
</FileVistaConfiguration>