If you are talking about Part 4 and Part 5 of Dva, then it’s a Patreon only release. It’s not yet available for free.
If you are a Patron and have downloaded version 0.16.1.2 or 0.16.2.2 then:
How to access new DVa's content: Just contact her by using laptop in MC's room. If you get lost in the process, be sure to check the Quest Log in Phone menu!