The only problem that you’ll encounter is there are limitations in using unlicensed windows 10. Unactivated Windows will only download critical updates; many optional updates and some downloads, services, and apps from Microsoft (that normally are included with activated Windows) also will be blocked.

Is it OK to use unactivated Windows 10?

Users can utilize an unactivated Windows 10 without any restrictions for one month after installing it. However, that only means the user restrictions come into effect after one month. Thereafter, users will see some Activate Windows now notifications.

What happens if you leave Windows 10 unactivated?

When it comes to functionality, you won’t be able to personalize the desktop background, window title bar, taskbar, and Start color, change the theme, customize Start, taskbar, and lock screen etc.. when not activating Windows. Additionally, you might periodically get messages asking to activate your copy of Windows.