Hi there! Sorry to hear you've had an issue.
The build of the game referenced in that error is the web-browser demo, not actually the full game (so the file 'TheRubyCourtWebDemo_v1.1' shouldn't be part of your purchased download).
Below I've posted an image of how the installation process should happen (if it doesn't appear like this for you, please let me know):
![](https://img.itch.zone/aW1nLzE2MzQ1MjE2LnBuZw==/original/11o1yr.png)
If there's still an issue, we can look into it further :)