Ugh, really sorry to hear that. Did you manage to get any version of the game to run? (although I understand if you didn't bother after getting the antivirus warning). The "Win" version is the 64bit version, I should label it better... Was it just not launching? Instantly crashing?
Had a couple people mentioning that their antivirus software is incorrectly flagging the Windows version of the game. Not entirely sure what I can do about it at the moment, however I'd love to know if the previous version of the game (0.34.2) also gets flagged by Avira. I'll try emailing you a direct download link to the older version of the game if you'd be be willing to try it out. (Let me know if you don't get an email from cairn4games@gmail.com) in the next 20 min or so.
You can also grab previous build versions through the Itch Desktop App (on the game's page, right click on the Version info -> Advanced -> Revert to Revision (and pick the version dated March).