there are 2 possible solutions:
1) download the patch that the author gave it for free (someone else posted it here a few posts back, but here it is again:
You must be registered to see the links
just roll down and you will see the blue button for downloading the link). if you install this patch you don't have to cheat for this part
2) the second way is by cheating. this tool in the link below works for this game, if you download and install it in the game, you can open it by pressing "L" in the keyboard. in the menu that will pop, you can use a drop down list to select any map in the game to warp, you can use it to warp to the town after you get the key from the lady in the inn. for some reason when you walk outside the inn, you get to a version of the town that should appear only later in the game (a version during night time, which probably is a programming error). be aware that if you teleport other places you might trigger something wrong, break the game and therefore need to restart the game (not the save, just the game by pressing F5)
https://f95zone.to/threads/rpg-maker-mv-mz-cheatmenu-v2-1-1.12121/
let me know if you managed, if you didn't, I can try explaining again