You can't activate Windows 10 completely offline. Activation requires a connection to Microsoft's servers to verify your license. However, you can perform a clean installation of Windows 10 without an internet connection, but you'll need to activate it later when you're online.
Here's how to do a clean installation of Windows 10 offline:
- Create a bootable USB drive: You can download the Windows 10 ISO file from Microsoft's website and use a tool like Rufus or the Media Creation Tool to create a bootable USB drive.
- Boot from the USB drive: Connect the USB drive to your computer and restart it. Access the boot menu (usually by pressing a key like F12 or ESC) and select the USB drive as the boot device.
- Follow the installation instructions: Windows 10 setup will guide you through the installation process. Make sure to choose the "Custom" installation option to avoid deleting any data on your hard drive.
- Activate Windows 10 later: After installation, you'll need to activate Windows 10 when you're online. You can do this by going to Settings > Update & Security > Activation and following the instructions.
Here are some other ways to activate Windows 10:
- Product Key: If you have a valid product key, you can use it to activate Windows 10.
- Digital License: If you've previously activated Windows 10 on your computer, you may have a digital license associated with your Microsoft account. This license will automatically activate Windows 10 when you're online.
Remember: Activating Windows 10 is essential for accessing all its features and ensuring your system is secure.