If you just downloaded the Xcode 15 beta from the Apple Developer website, you might have ended up with two files:

Xcode_15_beta.xip and iOS_17_beta_Simmulator_Runtime.dmg

If you launch Xcode you’ll see that the iOS 17 simulator is still missing, and you won’t be able to build and run with it quite yet. The good news is that it is easy to manually import the simulator runtime, and you don’t need to download it again via Xcode’s organizer.

Just follow these steps:

  1. In Xcode, go to Settings, Locations, and make sure the Command Line Tools is set to Xcode-beta 15.0
  2. On the command line run xcrun simctl runtime add ~/Downloads/iOS_17_beta_Simulator_Runtime.dmg
  3. After a brief time you should get a response that the simulator is ready.

For more details, check out the Apple documentation here.