Is CodeIgniter Wizard only for Mac?

Yes, CI Wiz is currently macOS-only. It is a native SwiftUI application distributed through the Mac App Store, and there is no Windows or Linux build. This is a deliberate choice — the app takes advantage of native macOS APIs and AppKit/SwiftUI conventions. A cross-platform port has not been announced. If you work on Windows, CI Wiz is not an option for you at this stage. The generated PHP code itself runs anywhere — only the generator application requires a Mac.