Firebird Data Access Designer (DDEX) installation

Prerequisites

Registry update

1. Remember to update the path in FirebirdDDEXProviderPackageLess32.reg or FirebirdDDEXProviderPackageLess64.reg, places where to update it are marked %Path%.
2. Install the .reg file into the registry.

Machine.config update

Add the following two sections to machine.config (located usually at C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config and C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config on 64-bit system).

<configuration>
  ...
  <configSections>
    ...
    <section name="firebirdsql.data.firebirdclient" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    ...
  </configSections>
  ...
  <system.data>
    <DbProviderFactories>
      ...
      <add name="FirebirdClient Data Provider" invariant="FirebirdSql.Data.FirebirdClient" description=".Net Framework Data Provider for Firebird" type="FirebirdSql.Data.FirebirdClient.FirebirdClientFactory, FirebirdSql.Data.FirebirdClient, Version=%Version%, Culture=%Culture%, PublicKeyToken=%PublicKeyToken%" />
      ...
    </DbProviderFactories>
  </system.data>
  ...
</configuration> 

And subst:
    %Version% With the version of the provider assembly that you have in the GAC.
    %Culture% With the culture of the provider assembly that you have in the GAC.
    %PublicKeyToken% With the PublicKeyToken of the provider assembly that you have in the GAC.

See also instructions for installing the older version that requires VS SDK: http://blog.vyvojar.cz/jirka/archive/2006/02/19/7471.aspx
and also instructions without it (and on 64-bit Vista) http://blog.vyvojar.cz/jirka/archive/2007/07/22/ddex-vista-64-bit-firebird-visual-studio-2005.aspx.