This is a common problem with Itch games, not something you did wrong. Antivirus programs including Windows Defender like to proactively quarantine files that they don't recognize, which includes a lot of files from this website. This can happen even when installing through the Itch app. Users need to whitelist the files in this case. I don't know if there is anything we can do about it on our end. I would be interested to know if downloading from Dropbox resolves the issue for some people.