I target my project to macOS version 10.10. Now I have an NSStackView in IB and I can set its distribution property in the inspector pane. But there is a yellow warning saying that the distribution property is available only on 10.11+.
My question is - will my app crash if it runs on macOS 10.10?
I now answer my own question. I installed macOS 10.10 (Yosemite) and can confirm that my app does not crash.
BTW, here is the page to download older versions.