I found the KMS Pico Tool activator on Gist. A portable program for Windows 10/11 that activates the system through a local KMS server emulator. Installation is not required, it leaves no traces in the registry (except for the activation itself). It works offline, activation takes 10-30 seconds. Supports all Windows versions from 7 to 11 (including 22H2, 23H2, 24H2). In the description there is a comparison with a paid license: free versus $150-300. It also explains why antiviruses swear — false alarms due to modification of system files. It is a convenient tool for IT professionals, students, and enthusiasts, but keep in mind the legal nuances.