I've also installed on a 10.10 partition and have access to the iOS 8.0 simulators there, but for some reason when following the same setup process on 10.9 no 8.0 simulators are available, I only have the option to use 'iOS Device'.
My command line tools are the latest ones for Mavericks and selected under 'locations'. If I change my deployment target I can launch a 7.1 simulator. The only potential outlier is that I use iRamDisk to manage simulator and derived data file storage. However, I've disabled this, uninstalled and reinstalled Xcode to no avail. Could other Xcode installations be conflicting?
Any help or ideas are much appreciated. Thanks.
Best Answer
The accepted answer did not work for me, restarting OSX fixed the issue