I found KMS Auto Pico Unlimited on Peerlist, one tool for activating Windows and Office. Supports everything from Windows 7 to 11 (all editions) and Office from 2007 to 2024. Auto-renewal every 180 days, unlimited number of PCs, works offline. The size is ~5 MB. For those who are tired of watermarks and restrictions. It runs on Windows 11 24H2.