Since yesterday, the public beta of Sierra macOS 10.12 for desktop and notebook Macs is available. Users who want to get the new OS version must register for the beta testing program that Apple offers to download the operating system via the Mac App Store.
It should be noted that the public version of MacOS Sierra, being a beta, is very likely to contain errors in your code, so it is highly recommended to perform a full backup of the data on your Mac in the event that need to downgrade to OS X. also, you should make sure your Mac is compatible with the new operating system.
Here's a short tutorial to teach macOS Sirera have on your Mac.
How to download and install the public beta MacOS Sierra:
- Make a backup of your Mac with Time Machine.
- Visit the official website of the program betas Apple Mac OS Sierra and log in with your Apple ID.
- Scroll down to the "Install Mac OS Public Beta Sierra" (Install Mac OS Sierra Public Beta) section and click on the button "Redeem Code" to start the Mac App Store.