Hello, usually the problem is with unpacking the archive or with the game save files. Please try these steps again.
- Restart your PC (this is a very important step).
- Delete the game files.
- Delete the save files at: C:\Users\YOUR PC NAME\AppData\LocalLow\Witch Pantsu\My Hotel In Other World
- Unzip the game files to the shortest path on your PC, for example, to the C:\H\ drive.