I added a potato setting in the game, hopefully its optimized enough for you to run it!
I got it downloaded on opera gx so I don't think its that...
Maybe it is your antivirus? Idk which one you have but I assume it'll tell you "blocked suspicious malware from downloading" or something like that rather then a vague message?
Can you tell me more about it? like is itch showing this message, opera, or windows? does it happen mid download or on start?