Overview of the G2A W8.1 Key
Overview of the G2A W8.1 Key
Get the Windows 8/8.1 upgrade installer from the official site. If the site rejects it initially, attempt to download an ISO for Windows 8/8.1 Pro, install it using a KMS key available on Microsoft's page (these keys let you install without a key), and then activate the key within Windows.
I also have a query about where to obtain Windows. My PC is brand new and hasn’t had any software installed yet, and the official site asks if I already have Windows installed before proceeding with an upgrade.