If you are using older versions of Windows product key such as Windows 7 or 8 and want to upgrade to the latest version of Windows 10 then you need to quickly do this because Microsoft will only allow users to upgrade to Windows 10 free to 31/12/2017, that is, more than a month.
Windows 10 was officially released on July 15, 2015, and within a year of its release, Microsoft allowed users of older Windows versions to upgrade to Windows 10 completely free and this upgrade time was ended on July 29, 2016. After this point, users will have to spend money to buy copyright if you want to upgrade and use Windows 10.
However, in practice, Microsoft still has a "back door" to allow users to upgrade to Windows 10 free, although this method is not widely publicized Microsoft. Microsoft office 2016 product key
has released a tool called "support technology," which allows users to upgrade to Windows 10 completely free of charge from older versions of Windows. This is considered an extensive upgrade program to further encourage users to upgrade and use Windows 10 product key
But Microsoft recently said the upgrade program will be officially closed on December 31, 2017, meaning that after this time users will no longer have the opportunity to continue free upgrade to Windows 10 and no other way than to spend money to buy the license to use this version of Windows.
So for those who are using the older version of Windows, there is still more than a month to think about whether to upgrade to the latest version of Windows 10 or not.
In case you want to upgrade to Windows version 10, you can download and use the free Windows 10 upgrade tool here, then run the downloadable exe file without installation and do the operation to Update to Windows 10 without having to pass any test steps.