Open Jack on Windows

The preview isn't signed with a Windows certificate yet, so Windows SmartScreen warns you the first time. It takes a few seconds to continue, and you only do it once.

1. Open the downloaded Jack-win-x64.exe.
2. Windows shows “Windows protected your PC”. Click More info.
3. Click Run anyway.
4. Follow the installer. Jack starts when it finishes.

You can only do this if you downloaded Jack from this site. If you didn't, don't open it.