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Well... In my perspective Windows 10 is quite expensive. Therefore I turned to Windows 8.1 pro, but in your store, the only available purchases for Windows, is Windows 10. So I've been willing to ask that, where can I buy windows 8.1 pro online or in your store, where I could download it and the product key will be sent to my email?
I've already downloaded the 64-bit Windows 8.1 (without the letters, K, KN, and N) but now I need the product key.
Just to let you know, we don't work for Microsoft.
Windows 10 is the only one Microsoft sells now.
They no longer sell 8.1
You will have to try amazon.com or somewhere like that.
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)
Microsoft issues a general warning about doing that.
https://www.microsoft.com/en-us/howtotell/Shop.aspx
Read Section: Beware of Product Keys sold separately.