Do I need to go back again from the start?
Viewing post in The Club Update - Free Public Release Now Available! comments
If you have a save before you decide where to go for the evening - so when you're given the choice to go to Matt's place, the party, or the club - you can load and play from there by picking the club option.
If you do that and get an error, or if you don't have a save, starting from the beginning and using the skip feature to fast forward is the quickest way to get to the new content. It'll zoom forward until you need to make a choice or if there's any dialogue you haven't seen before, then you can go back to skipping. Takes about a minute or two.