You have to be on the dev preview. Don't worry it's actually an enthusiast program just disguised as dev preview so carriers aren't involved. Don't worry, you can be a 'developer' too for free. But be warned that there might be some bugs. Instructions are here: http://forums.windowscentral.com/wi...-read-first-post-before-asking-questions.htmlTo clarify, I have updated to 8.1 and installed no further updates, and phone says it is up to date.