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I cannot launch the simulator successfully. Once I launch the IOS Simulator this error appears:
"Unable to boot the IOS Simulator."
Following the IOS Simulator error, I then get an error from Xcode reading:
Unable to run app in Simulator
An error was encountered while running (Domain = DTiPhoneSimulatorErrorDomain, Code = 2)
UPDATE:
This might sound silly but I went to Xcode/preference/Downloads with intentions of seeing a IOS 8.0 Simulator but there was none. Could this be the problem? Am I suppose to have a IOS 8.0 Simulator? If so can someone direct me how to get it? Also, under the "Downloads" tab in Xcode preference I do see IOS 7.0 and 7.1 Simulators and both work fine with Xcode 5.
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There are some advantages to this approach, but one of the annoyances is that you now have to launch the iPhone or iPad simulator by opening Xcode first. Well, that's not entirely true, you can actually still directly launch iOS Simulator without opening Xcode first by creating an alias.
Xcode 12.4 includes SDKs for iOS 14.4, iPadOS 14.4, tvOS 14.3, watchOS 7.2, and macOS Big Sur 11.1. The Xcode 12.4 release supports on-device debugging for iOS 9 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 12.4 requires a Mac running macOS 10.15. 4 or later.
If the app's code exists on GitHub, you can use the GitHub for Mac app to checkout the code, and XCode to compile the project and build it to the iOS Simulator. There should not really be any reason to have to install TestFlight on the iOS Simulator.
the trick is, to select the right command line tools! just select it here 
reboot(!) and everything is fine again :-)
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