mb wrote:
This exception is caused by trying to install to a database that has already been installed (i.e. already has tables).

To use an existing database, you only need to copy the Settings.txt file to the App_Data folder before you start the application. The installer runs if there is no Settings.txt file in this folder.
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But in my case the installer always starts even i have Settings.txt file in App_Data folder.
I am trying to publish my nopcommerce 3.30 many times but i am stuck on Installer page.