BTW I checked this out I think it requires the 1.09 update and so it’s built for 8.00 according to my sources.
8.00 update came out 14th Oct.
The DLC came out 20th Oct.
The 1.09 update came out on 21st Oct (requiring 8.00) however the update before that (1.08) was 7.55 and overlaps the DLC by one day.... so I suspect 8.00 minimum..... but there is weirdly a very small chance the DLC works on the 1.08 (7.55) compatible update.
We need someone on 1.08 update who grabbed the dlc on 7.55 OFW to confirm....