<InstallExecuteSequence>
                    <!-- Uninstall Sequence -->
                    <Custom Action="...">Installed and REMOVE="ALL"</Custom>
                    <Custom Action="...">Installed and REMOVE="ALL"</Custom>
                    <Custom Action="...">Installed and REMOVE="ALL"</Custom>
                    <Custom Action="...">Installed and REMOVE="ALL"</Custom>

                    <!-- Install Sequence -->
  <RemoveExistingProducts After="InstallFinalize" />
  <Custom Action="...">NOT Installed or REINSTALL="ALL"</Custom>
                    <Custom Action="...">NOT Installed or REINSTALL="ALL"</Custom>
                    <Custom Action="...">NOT Installed or REINSTALL="ALL"</Custom>
                    <Custom Action="...">NOT Installed or REINSTALL="ALL"</Custom>
            </InstallExecuteSequence>