Detailed information about upgrading to Windows 10 can be found here:

Toshiba Windows 10 Upgrade Information

Even if your model isn't supported for upgrade to Windows 10, you might still be able to upgrade if you're using Windows 8.1 or Windows 7.

You can find a brief summary of the upgrade instructions below, but it's best if you check the above link before upgrading.

Windows 8 and Windows 8.1

• Ensure you've upgraded to Windows 8.1 through the Store and have the latest updates from Windows Update.
• Check for updates from Toshiba through Toshiba Service Station.
• Read the instructions at the above link to ensure you've performed any other needed steps.
• Create backup recovery media before upgrading in case something goes wrong.

Windows 7

• Ensure your Windows 7 is fully upgraded through Windows Update, including upgrading to SP1.
• Check for updates from Toshiba through Toshiba Service Station.
• Read the instructions at the above link to ensure you've performed any other needed steps.
• Create backup recovery media before upgrading in case something goes wrong.