After poking around, it seems like KiCAD is a nice tool. As such, I thought I’d give it a go.
I’m running Windows 10 Home edition.
With the 4.0.1 and 4.0.0 installers, both 32 and 64 bit, I get a malware warning from Windows. I’d attach an image but as a new user I cannot.
In any event, I get an angry red dialog that reads in part:
Windows has identified this file as malware. Running this file might risk the safety of your PC and personal data.
Publisher: Open Source Developer, Marek Roszko
It then gives me the option to run anyway. I might be inclined to do this if I had a checksum to compare what I downloaded with what the official download checksum is, so maybe include checksums along with the executable downloads.