Unfortunate side effect of itch.io sometimes. If you're on Windows, you can got to "Windows Security" -> "VIrus & Threat Protection" -> "Protection History" and allow the most recent "Threat Blocked." Then retry the download. Would not recommend doing this for anything else, obviously, lol, or even keeping it as allowed after the jam, but that's how I've been able to play games that happen to trigger this. Hope this helped!