A walk in the park - a glitch. (The Surge)

Yes there is I also

Here's the thing:
Depending on your situation at the moment may be a few things. We are talking about the following:

If you go through the game and gradually got to the Park of the production centre B, before reaching the research Department, then you will need to get back on the train, on which you came here, and pass part of the plot of the original game until you get into the research Department. Only then will unlock the next part of the story DLC.
If you play "New game+", I can pass the next part of Supplement even if has not reached the repeated passage of the research Department.