I think the Unity engine no longer supports Windows 8, or you didn't download all the game files.
I downloaded the game archive and unpacked all the files. If some file is missing, then it is not in the game archive. BUT the game says that there is no entry to the UNITY.dll library, although this file exists at the specified path. Most likely it was compiled incorrectly. Many still have win 7,8. It is a pity that such high requirements for the game, although the game is simple. For this, of course, I will not install win 11, and even more so buy a new PC, since the old board does not support the installation of win 11
I have many games on this engine and they work on win 8. I think maybe it was worth using the version that supports older machines. You have greatly limited the number of possible players. You know better ...
so that there are no claims if someone pays and cannot play, indicate the compatibility of the program with the operating system