remove .tmp file from "C:\Users\......\AppData\Roaming\.minecraft\tmp" folder to "C:\Users\.......\AppData\Roaming\.minecraft" folder and you will be your louncher will be able to update.At least it worked for me
remove .tmp file from "C:\Users\......\AppData\Roaming\.minecraft\tmp" folder to "C:\Users\.......\AppData\Roaming\.minecraft" folder and you will be your louncher will be able to update.
At least it worked for me