Product key or license key is a very important part of the os service while purchasing or downloading the os.
How to update windows 10 pro without product key.
A unique product key is used to ensure the a single licensed copy of windows isn t being used on more than are allowed.
Microsoft allows anyone to download windows 10 for free and install it without a product key.
Enter your product key for the edition you are upgrading to whether it is pro or enterprise and wait while the product key verified.
For more info about how to keep your pc updated see windows update.
If you do have a copy of windows 10 pro or maybe you found a retail copy of the upgrade for less than microsoft charges you ll have a product key alternately called a license key that enables windows 10 pro.
But if you don t possess the product key for windows 10 specifically anyhow you can follow the methods mentioned above in the article to activate.
On the microsoft community forums charles of microsoft says.
Upgrade from windows 10 home to pro via a license key digital license.
You ll need it to replace your current license key.
From your windows 10 home running version 1511 enter the windows 10 pro default key under change product key.
And you can even pay to upgrade to a licensed copy of windows 10 after you install it.
Windows 10 requires activation to verify you re running a genuine copy.
Without the product you shall not be able to run your os in a proper executable way.
Paste or type your windows 10 pro product key and click next to start the upgrade process from windows 10 home to pro.
Select about then change product key or upgrade your edition of windows.
Before upgrading to windows 10 pro make sure your device is up to date and running the most recent version of windows 10 home.
But if you have a product key for windows 10 pro windows 7 professional or ultimate or windows 8 8 1 pro you can click the change product key button and enter that 25 character key here.
Click yes if user account control comes up.
To upgrade from windows 10 home to windows 10 pro and activate your device you ll need a valid product key or a digital license for windows 10 pro.