itch.io

it was a strange program popup, I can't remember what was it, but I got it immediately after installing it...
Maybe it was something else, unrelated to it, sorry

Windows Defender sometimes shows a false alarm for indie games, especially if the file is new or unsigned. (We’ve seen the warning on our own machines too.)

So far, we haven’t received any cases where a virus was actually detected, and our own scans using VirusTotal didn’t show any issues either.
We believe VirusTotal is the most reliable way to check if a file contains any virus:
https://www.virustotal.com/