Hello! The game files have been updated here. In order to get the updated version, simply download the game update again(v3.02 is the latest as of writing this post). Then run the game like you normally would. You can also delete the old version at this point, since it is no longer going to be needed. Through most of the updates, I try not to change a lot with the save files so that you don't have to start the game all over again every update. I believe that all versions after 2.6 are compatible with the latest update (so you don't need to worry about starting over).
Alternatively, you can also use the itch.io app and it should keep the game automatically up to date.
TLDR; you need to re-download the full game every time there is an update.
Hope this helps!