I'm on windows and I'm not sure if I did it correctly. It's still treating me as if I was in the old update.

Hi, if in the main menu you see the image of Angie that appears in the previews, it is the most recent version. Also, in the same main menu, in the lower-left corner, you should see the version, 0.1.5.1. 

Additionally, we recommend that you use the save file 1-2-LT1.save to start immediately with the new content.