Topic on Store talk:GOG.com
It is still available on PCGW content host provider http://pcgamingwiki.ams3.digitaloceanspaces.com/a/a0/GOG.com_DOSBox_Configurator_v2.png and not on Web Archive.
here is 99 articles (look to W-Z) http://web.archive.org/web/20151030044621/http://www.pcgamingwiki.com/wiki/File:GOG.com_DOSBox_Configurator_v2.png
as seen on this pic there is no Network tab. Im not sure i rid saw such on one-some builds from GOG. They present on one/some EA Origin DosBox builds. As you know GOG have separate Network link file which lead to same game exe with alternate conf file argument. But not to DosBox Configurator pre-launcher. Subj useful only as singleplayer pre-launcher... alas there is builds with Network tab?