Hi, If you don’t need to keep your original Windows 8.1 pro, you could upgrade to Windows 10 pro via the Windows Update or creation media tool that could download from here. If you want to setup dual Operating System, you need to buy additional Windows 10 license.
The only difference is that you will initially install Windows 10 Pro, but once you get it installed, the activation with the Windows 8 Pro upgrade pack key is the same as described in the article: After your device is upgraded to Windows 10 Pro, you’ll need to activate Windows.
If your win 8 pro was activated the fastest way to upgrade too win 10 is too do it from the ISO. You can get the current iso here. If the win 8 was activated the upgrade will be free if you do it before April 28, 2016 The fastest way to get the upgrade is to download the ISO.
Another thing we asked ourselves was, what happens if you install Windows 10 without an upgrade?
Doing a clean install of Windows 10 without first doing an upgrade can cause activation problems on computers that had Windows 7 on them at the beginning of life because there will be no digital license for Windows 10 established by doing an upgrade first, and no product key stored in BIOS firmware usable to activate Windows with.
Can Windows 10 be installed on a deactivated Windows 8?
Although Microsoft suggested that Windows 10 would be a general upgrade that will even install on a deactivated Window, the result will never be fruitful as compared to the case of activated Windows. To know if the copy of Windows 8 is enabled, hit on Windows+W to open up the Settings Search.
How to change the Windows 8 to Windows 10 version?
It is not possible to change the editions. When you are ready, you have to run the installer application. Follow these steps to upgrade Windows 8 to Windows 10: 1. To upgrade the system, a window will open up on the screen. Choose an option of Upgrade this PC now and then, click on Next. The tool will download the installation files.
Sometimes there are problems upgrading. For example the free space in the partition could be insufficient. There could be incompatible software/applications that need to be uninstalled before the upgrade.