Guide for upgrading from Win7 to Win10 without buying a new version.
Guide for upgrading from Win7 to Win10 without buying a new version.
Using your Win7 key will enable the installation of Windows 10. Despite their claim to have discontinued free upgrades, they continue to offer this option.
If they're portable retail keys, you can simply use the old ones. But if they're OEM keys, they should still function as long as they haven't been used on another device before.