Extend your activation grace period by 30 days
The 30-day period before activation is required is called the grace period. If, at the end of that 30 days, you are not ready to activate, you can extend the grace period by an additional 30 days and continue your evaluation. Open a Command Prompt window using the Run As Administrator option and type the following command: slmgr -rearm . When the command completes, restart your computer. You can run this command a total of three times, giving you up to 120 days of use before activation is required
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