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I have installed Microsoft Windows 8 Pro.

I want to activate it. I have tried to buy Windows 8 Pro by using the "Buy a new key" option but it's not working.

So it looks like before I buy Windows it will be in trial. It is not showing me the date of the trial expiration.

Someone let me know how I can use it for 90 days (as a trial before I get it). How I can check the trial's expiration date?

This photo shows what happens when I run slmgr.vbs -XPR in the command prompt:

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See Is Windows Pro usable without activation? question. – DzinX Nov 5 '12 at 11:32
@user1769787 - You will have to use Windows 8 Enterprise 90 day, at the end of 90 days, you can format your system and install Windows 8 or Windows 8 Pro. – Ramhound Nov 5 '12 at 13:32

To check Trial Version Expire Date. ( Only For Windows 8 DP CP RP )

Open winver command via Run Win Key+R or in MetroUI Startmenu.

Reference Image showing Expire Date

To upgrade any Windows 7 / Windows 8 DP CP RP etc..

Upgrade Assistant

Windows 8 RTM Evaluation for devs. 90 days

Once the evaluation period expires, your desktop background will turn black, and your PC will shut down every hour to prevent you from using it.

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-1: This does not show an expiry date on Windows Pro (not Preview). – DzinX Nov 5 '12 at 11:31
DzinX, thanks for indicating error, i have added cautionary note that it is only for DP CP RP. I will update it with more details sooner. – Mayura Nov 5 '12 at 12:28
@MayurPipaliya - There isn't an evaluation period for Windows 8 and Windows 8 RTM. Only Windows 8 Enterprise has a 90 day trial WHICH CANNOT be upgrade to a full copy. – Ramhound Nov 5 '12 at 13:30
DP=Developer Preview; CP=Consumer Preview; RP=Release Preview – sammyg Sep 9 '14 at 15:24

with winver command you will not see the expiration date, if your windows is already activated (for instance you activate your system with 1 year key license). please run this command to see your system expiration date: slmgr/xpr

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Displaying the verbose licensing with slmgr /dlv worked well for me. – Cameron Taggart Jun 28 at 20:04

Open a command prompt and type this command:

Cscript Slmgr.vbs -dli

It willdisplay how much time left before you must activate.

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oops, sorry I forget to put it on post. please check it. – user1769787 Nov 5 '12 at 6:14
I think you meant slmgr /xpr. "Expiration date for current license state". That's what it says if you run cmd /c slmgr from Run prompt. The switch -dli is to display license information. And -dlv is to display additional (v for verbose) license information. – sammyg Sep 9 '14 at 16:30

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