Note: If you have money to pay for the key, you can activate it immediately and switch to your usual business. Even though the key is 100% valid, watermarks will still be visible on the desktop in the future. Incompatible version of Windows - This means that the key you purchased is for Windows 10 Home Edition and one day you will reinstall Windows 10 Professional Edition on your computer. It doesn't work because it's been used by someone else and Microsoft and is blocking other users from the same product key using online activation technology. Invalid Windows license - You can enter a key that you can get from online sources. We have the same problem on many Windows computers that are activated by KMS or other Windows activation tools. This is the most common reason why a watermark appears.
Windows has expired - If your Windows license expires, this watermark will appear on your screen. First of all, you need to know why this watermark is on every computer or computer.
