However if you’re running the tool on a different machine you can save the installation files to a USB by selecting the second option.You can also save the Windows 10 installation files as an ISO file.
The upgrade only applies to those running Windows 7 Home or Home Premium with Service Pack 1 or higher installed and Windows 8.1.
After that has downloaded, people need to run the Media Creation Tool.
You can then choose ‘Upgrade this PC now’ if you have downloaded the Media Creation Tool onto the PC you want to upgrade and if you’re only upgrading one machine.
If you don't have a system restore disk already, it's a good idea to make a full system backup, using disk imaging software such as Macrium Reflect, which makes a bit-by-bit copy of your hard drive. However, if you want to create your own USB or DVD media, see the section below on "How to Create Windows 8 Install Media." Though it requires a few extra steps and a blank Flash drive or disc, creating your own install media allows you to not only install on multiple computers, but also reinstall on your current computer if something goes wrong. You may want to walk away, as this also takes several minutes.
Finally, make sure you have 1 to 2 hours free to run the install. The tool will take a while to download the software so be patient, particularly if you have a slow Internet connection.