Does not require installation, allowing it to run from a USB drive. All-in-One Activator:

One by one, the "Activate Windows" watermarks on the perimeter monitors vanished. The Office icons stopped their nagging prompts. The digital fever broke. Elias watched the systems settle into a calm, licensed silence.

KMSPico is an activation tool based on Microsoft’s Key Management Service (KMS) technology. Originally, KMS is a legitimate service used by large organizations to activate many computers over a local network.