Note: upon restart of your computer and launch of Xcode, you will be able to get/install the simulator
melonhead
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I had the same issue. This is what helped me (I gleaned this knowledge from another thread):
delete the 'Developer" file in hard drive>Library>Developer
Empty the trash.
Deinstall Xcode.
Re-install Xcode
Restart your computer
Open Xcode, the simulator should be able to be installed now
The "Developer" folder automatically gets created upon installation/launch of Xcode.
I hope this works!
PS. If anyone knows how to fix the "Unknown file type" error in an Xcode build, please let me know!