Android 8.1 Oreo is available. What's the difference between old and latest

Google says it’s working with its partners to deliver Android 8 to phones “by the end of this year,” and there are a lot betas already in the works from Samsung, Essential, HMD (Nokia), Huawei, HTC, LG, Motorola, OnePlus, and Sony. OnePlus says an Oreo update will be available by the end of the year and HTC is promising an update to the U11 and U11 Ultra by the early December.

OK, I have one of the supported phones. How do I get the update?

Once the Android Oreo update is ready for your phone, you’ll receive a notification of a pending system update. Tap it and you’ll be taken to the Settings app where you can proceed to download and install it. If by chance you want to install the update manually, 

Do I need to unenroll from the beta program first?

Nope, there’s no need to do that. Even though your phone will continue to say you’re enrolled in the beta program, once you get the update, you’ll still be running the final version of Android Oreo, just like everyone else. And as new betas land for 8.1 and beyond, you’ll be among the first to get them, too.