KMSPico is the gold standard for "definitivo" (permanent) activation. It works by emulating a Key Management Service (KMS) server locally on your machine, tricking the system into thinking it belongs to a corporate network.

Windows 8.1 remains a popular choice for older hardware because it's lightweight and fast. However, without activation, you’re stuck with: An annoying "Activate Windows" watermark.

1 or perhaps a guide on how to for a clean install?