: You can check your activation status in Settings > Update & Security > Activation . Essential Windows 10 Pro KMS Client Keys

He opened a new Notepad file and typed, almost as a joke: windows 10 pro activation key 64 bit.txt

If budget is tight, explore legal alternatives: the free Windows 7 upgrade path, student discounts, or even using Windows 10 unactivated (which runs forever with only minor cosmetic limitations—no key needed at all).

(Note: The above is a generic installation key, not an activation key.)