I was surprised to see a Windows 10 Pro Post getting heat on here because its legitimately available for free from Microsoft.microsoft.com/en-…ISO
Follow the link from the target PC to upgrade for free or create a boot disk to install a new copy. I've done both several times and it works a treat. Enjoy.
1. Go to the Download Windows 10 website.
2. Under Create Windows 10 installation media, click Download tool now and Run.
3. Choose Upgrade this PC now, assuming this is the only PC you're upgrading. (If you're upgrading a different machine, choose Create installation media for another PC, and save the installation files.)
4. Follow the prompts.
5. When the upgrade is complete, go to Settings Update & Security > Activation, and you should see a digital license for Windows 10.
It should be noted that if you have a Windows 7 or 8 Home license, you can only update to Windows 10 Home, while Windows 7 or 8 Pro can only be updated to Windows 10 Pro. (The upgrade is not available for Windows Enterprise. Other users may experience blocks as well, depending on your machine.) This upgrade using the media creation tool isn't meant for the general consumer, but it works for many nonetheless.