How to migrate from Windows 7 to Windows 10 double bootcamp boot on Macbook late 2011 - MacOS High Sierra

As per my understanding, If you have a Macbook running a "genuine" copy of Windows 7/8/8.1 (properly licensed and activated), you can follow the same steps I did to upgrade it to Windows 10.

Boot your MacBook from your Windows 7 and carry the steps:

To get started, go to the Download Windows 10 webpage and click the Download tool now button. After the download completes, run the Media Creation Tool.

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Choose the Upgrade this PC now option and be done with it.

Then just follow the prompts to complete the upgrade. You will not be asked for a product key, and when the upgrade is complete and you've connected to the Internet, you'll have a digital license to Windows 10, which you can confirm by going to Settings > Update & Security > Activation.

The digital license is associated with that specific device, which means you can reformat the disk and perform a clean installation of the same edition of Windows 10 anytime. You won't need a product key, and activation is automatic.