Step 1
Open a administrator Command Prompt(cmd.exe)

Step 2
If prompted by UAC, Click Yes.

Step 3
Check current status by running the command below.

slmgr.vbs -dlv

A pop-up window will appear and current status is displayed.

Step 4
Rearm Windows trial license by running the command below.

slmgr.vbs -rearm

After pop-up window shows “Command completed successfully”, restart the machine.

Step 5
After restart, re-run command in Step3. And the expiration date has be renewed.