Hello Divya, I am Henry and I want to help you with your concern.

There are a few different ways to do it depending on your current situation. Here is a guide to help you.

Method 1: Upgrade from Windows 11 Home

If you already have a computer with an activated version of Windows 11 Home, you can purchase an upgrade directly through the Microsoft Store. This method converts your current system to Pro without needing to reinstall anything.

Steps:

1. Open Settings on your computer.
2. Go to System and then click on Activation.
3. Under the "Upgrade your edition of Windows" section, click on Open Store.[link]
4. You will be taken to the Microsoft Store page for the Windows 11 Pro upgrade. You can complete your purchase there.
5. After the purchase, the upgrade will begin, and your system will restart with Windows 11 Pro.

Method 2: Buy a Full Digital License from Microsoft

If you are building a new PC or need a new license for a computer that doesn't have one, you can buy a full digital license directly from the official Microsoft website. Buy Windows 11 Pro or Windows 11 Pro

On this page, you can purchase a digital download of Windows 11 Pro. After your purchase, you will receive a product key that you can use to activate Windows during or after installation.

Key Differences Between an Upgrade and a Full License

• Upgrade License: This is tied to the hardware of the PC you upgrade. It's generally not transferable to a new computer.
• Full Retail License: A full license purchased from the Microsoft Store can be transferred to a new computer if you decide to build a new one or replace your current machine in the future.

I hope this provides the clear guidance you were looking for.I f you find this guidance helpful, you're welcome to click 'Accept Answer'—it helps others find useful solutions too.