Why this happens
Sometimes the Activate button can disappear or be hidden if your display zoom (scaling) is set too high. This makes the confirmation button move off-screen so you can’t see or click it.
How to fix the problem
Step 1: Open Settings
On your computer, click the Start menu and select Settings.
The Start menu is the Windows logo button in the bottom-left corner of your screen. You can also open it by pressing the Windows key on your keyboard.
Step 2: Go to Display settings
In Settings, open System.
Select Display.
Step 3: Adjust zoom/scaling
Find the setting for Scale (sometimes called zoom).
If it is set to higher than 100%, change it back to 100% (Recommended).
Step 4: Try entering your license key again
Return to the activation screen.
Enter your license key in the field.
The Activate button should now appear, as shown in our example image.
Extra tip
If you prefer larger text or icons, you can temporarily set your zoom back to 100% to activate your license, then change it back to your preferred setting afterward.