How can I run the iOS 7.1 Simulator in Xcode 7.0 beta 2?

Took a lot of browsing but I finally found a solution that worked for me (tried Gend's answer but didn't work). Execute the following lines:

sudo mv "/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 7.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib"{,.bak}sudo ln -sf "/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/system/host/liblaunch_sim.dylib" "/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 7.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib"

Source: https://gist.github.com/leecade/83b4e710d7c741152527

You can't (At least in an Official way).

Taken from Xcode Beta 2 Documentation (Page 7).

Hope it helps.

EDIT SEPT - 2015:

Thanks Cœur for the info, now you can use previous versions of ios simulator.

First, find the target file:

/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/system/host/liblaunch_sim.dylib

You need make backup liblaunch_sim.dylib (Just in case). Second, copied to destination (Remember to backup)

/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 7.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib

And If need it to:iOS 8.1.simruntimeiOS 8.2.simruntimeiOS 8.3.simruntimeAll done.

Hope it helps.