im also stuck there
For those who are stuck on the 2nd floor of the ruins, you first need to have done two or all three Town of Wisdom quests (which are in the forest) and make sure that you do not have this item key SHOP KEEPER AIS MODULE in your inventory.How to open the second floor of the ruin?
If you have it and have not yet spoken to the AI, modify the save file and delete it, because if you have it and talk to the AI, it will give you 5 points for the store, when originally it had to open the store for us and return to the safe room and we can enter the sealed door and play the mini game of questions.
I used the RpgMakerSaveEdit application to do it. I don't know if the online save editor allows you to see the key item that gives the bug and not advance with the quest of this town.