Unlocked HTC 10 starts getting Android 8.0 Oreo in the United States
Although the handset maker published the update files a month later, Android Oreo wasn't pushed OTA (over the air) to HTC 10 devices. Well, that's no longer that case since many owners of the unlocked HTC 10 report they received the highly-anticipated Oreo update.
Keep in mind that this is a fairly sizable update, so make sure you have enough storage before attempting to download it. According to the changelog, the file size weighs in at 1.32GB and contains some other system improvements besides Android 8.0 Oreo.
If you're rocking an unlocked HTC 10 and have yet to receive the update, then you should give it some time since this is a staged roll-out that might take up to a week to propagate to everywhere in the States.