hi Helena :) yes, absolutely. We just need to figure out some technicalities - for the last year we wanted to move to a system when you would download IA1 & then the other chapters as DLCs. We don't yet have all the bugs fixed to move to that.
Over the last two years it became clear that it's too much of an overhead to release each chapter / part as a separate Steam game, so we began developing a system where each chapter would be a DLC.
So, in short - yes, we're testing it. As soon as it's bug-free (hopefully October) we're releasing.