Getting phone 8.1 for 8s unlocked versions?

[WPCentral Question]

all right, I've already looked at several forums that people have 8.1 on HTC 8s say to get the 8.1 you have to download the developer app or whatever from the store and then hit the update button in Setting, is that correct or is there some other way???? Also I have an unlocked HTC 8s
Thanks for helping