Hey! I tried to download the game on a different pc and everything seems to work alright. Did you make sure to download Day 2.rar, not the build or the icon by accident? Did you open the unity project on version 2022.3.5 or higher?
Viewing post in Day 2 - Sheep Herder [Unity] comments
Yes! Sorry for the late reply, but it sounds like you managed to get it to work.
In case anyone else has the same problem: You extract the Day2.rar file using a program such as winrar or 7zip, after which you have the folder containing the project's assets. From that point you can open it using Unity Hub.