"I don't have a product key"

Solution


Other than no personalization (Changing the appearance) not really. http://www.howtogeek.com/244678/you-dont-need-a-product-key-to-install-and-use-windows-10/

Do you have 10 now?

DO you have 7 or 8?

https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-change

Do you use the magnifier within Windows or do you use any assistive technologies that allows you to use Windows?

https://www.microsoft.com/en-us/accessibility/windows10upgrade



Other than no personalization (Changing the appearance) not really. http://www.howtogeek.com/244678/you-dont-need-a-product-key-to-install-and-use-windows-10/

Do you have 10 now?

DO you have 7 or 8?

https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-change

Do you use the magnifier within Windows or do you use any assistive technologies that allows you to use Windows?

https://www.microsoft.com/en-us/accessibility/windows10upgrade

 
Solution


Not entirely accurate. Used to be that way. And I used to LOVE to game with XP. Forget XP, I loved the Atari 2600. Anyways, times and their licensing language has significantly changed.
 


Assuming this is Win 10:
You lose any Personalization functions. Watermark at the bottom right.
There is no more 30 day grace period as with previous OS versions. It starts nagging from day 1.

But I have an unactivated Win 10, running in a VM, to test just what happens.
First installed on Dec 8, and no real difference so far.


If this is a prev version, you have 30 days, and then bad things start happening.