Need assistance with your Windows upgrade license?
Need assistance with your Windows upgrade license?
You can upgrade using the Windows 8.1 Pro ISO while still having your existing Windows 8.1 Pro license. The upgrade process will not force you to purchase a new license; it will allow you to continue using your pre-paid code.
You need your Windows 8.1 Pro license key to finish the installation
Just transfer the ISO to a DVD or USB stick, start it up and skip formatting. Your old data will stay in a special folder called "Windows.old," and everything should be okay—new setup is faster, so you're good to go.