Update adviser is to let you know whether or not your phone is compatible and for when MS/Carrier have the official WM10 update ready for your phone. Windows Insider is so you can preview pre release builds of WM10 on your device. Which ring did you choose? I updated my wife's 640 to the insider release preview ring for the .242 update(which will be more stable than the slow or fast rings) then removed her from the insider program so she'll get the next production release. I hope this makes sense, let me know if you need me to clarify anything.