SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/administration-configure-elmah-on-your-site

ConfigureELMAH_2.xml

<!-- Find the following connection string and replace the asteriks with the correct entries -->

<connectionStrings>
    <add name="elmah-sqlserver" connectionString="Data Source=****;User ID=****;Password=****;Initial Catalog=****;" providerName="System.Data.SqlClient" />
</connectionStrings>

<!-- In the <httpModules> section, add the following line: -->

<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" />
          
<!-- In the <modules> section, add the following line: -->

<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />