A Windows PC cannot build an iPhone app
Apple only allows iPhone apps to be built and signed on macOS using Xcode, which Apple does not release for Windows. This is Apple's restriction, not a missing feature in Cura — no setup, emulator, or virtual machine makes it work reliably.
What you can do instead
- Borrow a Mac for about thirty minutes — the signature it installs lasts 7 days and can be renewed on any Mac.
- Use an Android phone instead, which builds fine from Windows.
This is a limit of the phone and computer combination, not of Cura. Every other combination has a full guide.