So, I tried downloading it with a VPN, since downloading from my own IP gave me no issues. I also got the same warning from itch, when I did it with the VPN. I'm pretty sure I'm currently shadowbanned, which is most likely because some joker uploaded one of my new projects on here, without asking me. I only discovered the unauthorized upload, after I had uploaded the official version on here myself. I guess itch staff saw two pages for the same game on here, got sus and now has shadowbanned both accounts, until they (hopefully) come to the conclusion that my account is the real developer of the game.
So, in short, you don't have to worry about any viruses, this is because of the current shadowban.