Windows 8 extend trial

How to extend the 90-day trial period of Windows 8 Enterprise (step-by-step)

Here is the thing, you’ve been testing the pre-releases of the new Microsoft’s OS, then you moved to the 90-day trial of Windows 8 Enterprise final which is offered by the company for free.

Now, if you are using the operating system in your main PC, you’ve got so used to it, you already made it your own and now all of a sudden, you noticed in the watermark in the bottom-right corner of the screen that Windows 8 is running out time. And what is worse, Windows 8 Enterprise 90-day trial cannot be upgraded. One solution for this is, of course, backup your data and make a clean install of the OS, but if you don’t have the time, you can extend the trial period of Windows 8. Here is how:


To rearm the evaluation copy of Windows 8 pass the 90 days do the following:

1 While in the Windows Desktop, place the mouse pointer in the bottom-left corner of the screen, right-click and from the menu, click Command prompt (Admin).

2 Check the Windows 8 license information by typing the following:

slmgr /dli

Or use this command to view even more details of the license:

slmgr /dlv

And to see the expiration date use this command:

slmgr /xpr

Quick Tip: To use Windows 8 trial for the longest time, make sure you use these instructions close to the end of the trial. And remember you must complete activation before August 15, 2013, to use this evaluation.

3 To extend the Windows 8 license grace period simply use this command:

slmgr /rearm

Finally don’t forget to restart your computer to see the expiration date extended.

You can use the rearm command up to 3 times, which in theory will allow you to run Windows 8 for free for up to 270 days (almost a full year). Now you can enjoy Microsoft’s operating system for a bit longer, if you don’t have the time to do the work and upgrade.

  • Ed Santiago

    what will happen to my data if i extended the trial? will it be deleted?

    • Mauro

      Hello Ed,
      Nothing will happen to your data. It will only reset the days for the trial to 90 days once again. You can only do this up to three time though.


  • Ed Santiago

    hi good day! i performed the “re arm” for the extension of my windows 8 it was unsuccessful it say error: 0xc004F025 Access denied: the requested action requires elevated privileges.. what will i do? need help on this.. thanks

    • Mauro

      This happens when you not running Windows Command Prompt “As an Administrator”, make sure to click “Command prompt (Admin).”


  • Ed Santiago

    Hi Mauro,

    thanks you are right.. just press the ctrl+shift+enter… i became the admin… now enjoying the other 90 days extension.. thanks a lot.. more power..

    • Mauro

      No problem Ed,
      I am glad it worked. Enjoy!


  • Roker Super

    it says unrecongized option.Plz help me…..

    • Mauro

      Are you running the Windows Command Prompt “As an Administrator”?


  • गोपाल कुमार

    but, my file is open notepad..?

    • Mauro

      You may be doing it wrong. Try to run the command prompt as administrator and type the commands.


  • Niyaz

    How To Make myself an admin?

    • Mauro

      Do a simple search for CMD or Command Prompt, right-click it, and select Run as Administrator.


      • Niyaz

        Thank You! But just one more thing. So, If I rearm this only three times the most, does it mean when it expires again and we do the command can’t work again, or what?

        • Mauro

          Hello Niyaz,
          After 3 times you have to reinstall the operating system. The trial version of Windows was meant for testing only. This isn’t a trick to get a full version of Windows forever.

          I hope this helps,

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  • Jtrdfw

    I tried this as my license expired later today. It sound command was successful, however all it did was make my timer go immediately to zero. I haven’t done it before this point.

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  • Jose daniel gamboa percy

    Hello Everyone,

    If you have the latest Windows 8.1 Version, the Microsoft Company set the re-arm limit to “1”. The re-arm can be still reset by Re-installing the OS. Otherwise you can still use Windows 8.1 without any other option/features – and don’t forget that Windows 8.1 will no longer shut down every hour. This means that the Microsoft will no longer provide 360 days of using Windows 8. As for result, you can only use Windows 8.1 Pro features for 180 days. (If windows 8 – Windows will ask you to activate the OS or will keep shut down every 1 hours, with also dis-activating all other features instead). Other coders can still code up the Windows Registery – setting re-arms to unlimited times. But keep a note that this is illegal so please do not try to use this.

    For people who is still using Windows 8, please update your OS to Windows 8.1 for best results of your computer performance and bug fixes.

    Thanks for reading,

    • Mauro

      Awesome information, thanks for the heads up. I’m using Windows 8.1 Enterprise eval and the rearm works the three limit times. Really interesting to hear that is different for Windows 8.1.


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  • johngrivera

    I installed a trail version of windows 8.1 enterprise evaluation and after the trial expired I did what you said to do here and was able to renew the trial for 90 more days and now that my 90 days are over in just 15 days I am trying to renew the thing before then since you said that we can renew the trial a period of 3x before we can no longer do this.

    However it says right there “Error: 0xC004D307 The maximum allowed number of re-arms has been exceeded. You must re-install the OS before trying to re-arm again.”

    Why is this? I have only used 1 of my 3 re-arms to renew the trial for 90 days so how come I am not getting 2 more re-arms like you said I should be able to get? Help is appreciated thanks.

    • Mauro


      This guide applies to Windows 8, no Windows 8.1 or Windows 8.1 Update. Though it should, after installing these updates, it seems Microsoft has change the way you can use their trail software.

      I haven’t try, but I heard this should help with the error: 0xC004D307, which refers to the maximum allowed number of rearms has been exceeded.

      1. Open regedit
      2. Change the following registry key to:

      HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows NT/CurrentVersion/SoftwareProtectionPlatform

      Important: Please note that changing registry keys in Windows can cause problems. Make sure to backup first.