how do u get day 3..
Hm that's strange. Can you try deleting all the game files, and following this bit in the description:
If there's any issues; it might help to go to %appdata% > Renpy folder > deleting the Mushroom Oasis folder as it gives the game a fresh start.
Afterwards, try re-downloading the files above. While it will delete all your progress and going through the dialogue is a drag, you can go to the settings, and toggle Unseen Text under Skip so you can just breeze through Days 1 and 2:
There are no points from Days 1 and 2 so any choice is fine! Let me know if you get to Day 3!