Windows 10: Lost product key for Windows 10 Professional x64

So I bought my PC about a year ago and got a license for Windows 10 Professional. The key was written on a box I got with the PC, however, due to unfortunate circumstances involving my mother just throwing away those boxes for no reason, I have lost the key. I have been asked to activate Windows today, and with no key, it seems impossible. Is there a way I can get the key back this way? Thanks.

:)

 

Using Windows 10 Professional Product key to Windows 8.1 Professional

You have to buy windows 8.1 Pro.

The Windows 10 key is only for Windows 10.

There is Downgrade Rights but you don't qualify for it as you bought Windows 10 Pro yourself and they only apply to OEM preinstalled Windows 10 OEM licenses (Dell, HP, etc)

Here is the information about Downgrade rights. It is an old Microsoft link which they removed but the information still apples>

Device Partner Center

Downgrade rights for Windows software
The following OEM versions of Windows software are eligible for downgrade rights.

[table][tr][td]Windows 10 Pro includes downgrade rights to:

• Windows 8.1 Pro
• Windows 7 Professional

[/td][td]Windows 8.1 Pro includes downgrade rights to:

• Windows 7 Professional
• Windows Vista Business

[/td][td]Windows 7 Professional and Windows 7 Ultimate include downgrade rights to:

• Windows Vista Business and Windows Vista Ultimate
• Windows XP Professional, Windows XP Tablet PC Edition, or Windows XP x64 Edition

Note Other OEM Windows 7 versions (for example, Windows 7 Home Basic and Windows 7 Home Premium) do not include downgrade rights.[/td][/tr][/table]

Note downgrade rights are only available as long as Microsoft provides support for that earlier version,
as outlined in the
Windows lifecycle fact sheet.

Steps for an end user to downgrade Windows software

To downgrade eligible Windows software, end users must:

• Purchase a PC preinstalled with Windows software.
• Accept the Microsoft Software License Terms.
• Perform the downgrade process to the eligible downgrade product using the media/key from a genuine, previously licensed OEM or retail product.

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Microsoft no longer sells any edition of Windows 8.1.

try amazon.com, etc.

Warning:

You do not buy a Product Key by itself, as they are normally stolen/pirated, Volume Licenses which are not for private use, or MSDN keys which are not to be sold by the original subscription holder.

Make sure that you buy the complete sealed package (DVD, license)



https://www.microsoft.com/en-us/howtotell/Shop.aspx



Read Section: Beware of Product Keys sold separately.





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windows 10 key

Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?

 

Using Windows 10 Professional Product key to Windows 8.1 Professional

HI,

Due to some inconvenience while using Windows 10 Professional, I want to use Windows 8.1 Professional.

1. Can I use the Windows 10 Professional product key to activate & use Windows 8.1 Professional?

2. As I have already purchased Windows 10 Professional License, don't want to pay again for Windows 8.1 Professional.

Please Suggest...

Thanks..