But in July, Apple will release betas of iOS 10 and macOS Sierra to the general public. If you’re game for running a beta operating system, you can get your hands on the software by joining the Apple Beta Software Program.
Since this is software that’s still being worked on, don’t be surprised if you encounter a few problems. This is where Apple needs your help; the betas include Apple’s Feedback Assistant app, where you can report problems to the company. Apple updates the betas the same way it updates final OS software, so you can keep checking for problems and give feedback.
Before installing a beta OS, always back up your data.
Go to the Apple Beta Software Program site and sign up.