Directly upgrade:
Three steps to upgrade your Windows with the license key:
1. Click 'Start' menu - 'Control Panel' - 'All Control Panel Items' - 'System'.
2. Click 'Activate Windows' or 'Change Product Key'.
3. Click 'Activation' and enter the license key you bought.
New install:
Can't upgrade directly from an older operating system?
Don't warry, you can activate new Windows 10 with our license key, after you download and install a correct edition.
Windows 10 download link:
https://www.microsoft.com/en-us/software-download/windows10
During installation, you'll be prompted to enter the product key. Or after installation, to enter the product key, select the 'Start' button, and then select 'Settings' > 'Update & Security' > 'Activation' > 'Update product key' > 'Change product key'.