It isn't opening
If simply running the exe file from zip file doesn't work
Download zip file, put it on your dekstop or anywhere you want. After that right click the zip folder and find an option extract here. Once you extract it, you should see a yellow folder with the same name as the zip file. Open the yellow folder and find the game icon.
Make sure that the EXE file is still in the folder. Don't move the exe from the folder.
If you haven't seen it, there is an install instruction above the download game button
You shouldn't have a problem downloading the game if it's on windows, message me back if it's another operating system or if there are other problems.