When you activate Win10, you see a hint that this version of the license has expired, what's going on? How should this problem be solved?
Through the test, there is this hint, one reason is your computer time is not set, may exceed the preview version of the period of use, so we just reset the correct time, there is another reason is that your preview may not be updated for a long time, try to update to the latest version try.
Microsoft has since April 1, 2015, began to send a notice to users, reminding users of the need to upgrade the computer to a new version, such as Win10 has launched a new technology Preview version, you can upgrade to the latest version to solve the problem.
This is the activation of the WIN10 prompt license has expired, that is, as long as the WIN10 appears as a hint, because you are using the WIN10 or before April 1 version, as long as the WIN10 upgrade to April 1 after the version will not appear that hint.
