I downloaded ios 10.3.1 version in xcode 9.4
But I only can select the ios 11 version I already have.
I rebooted OS and restarted Xcode already. I also can see ios 10 simulator when I select "add additional simulators"
There are ios10, 11 simulator both of them. I don't know how to use ios 10 simulators in xcode that I already downloaded.
If I understand your problem correctly, changing Deployment target should help. It can be found in General section of settings shown when you first launch the app.
To use that the project compatibility should be lesser. That means the Deployment target in your app should be from iOS 10.
Go to project target settings . Deployment target --> 10.x
As the previous answers didn't help me, I'll describe my solution.
The deployment target doesn't always solve the problem, as well as creating a new scheme. The simulators don't appear automatically.
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