itch.io

This is a false positive from Windows Defender. See: https://www.patreon.com/posts/windows-defender-86677419 and, for the exciting conclusion: https://www.patreon.com/posts/and-so-ends-saga-86686322

You can follow the instructions in the second image to update the cache for Windows Defender, or honestly just install it anyway, there should be an option to do that, I think.

But yeah, just a false positive.