I don’t use Windows, I play on Linux but here are some suggestions:
Download again, make sure downloaded file is complete and error free.
Remove the current installed files and unzip the package, watch out for any error or warning messages displayed.
Try starting game.
Windows users have had problems with antivirus or some such preventing game running, but you got it started so maybe that is not the issue. Some have reported it matters in which directory game is installed, but I do not know Windows stuff.