Offline activation is designed specifically for situations where the target computer has no internet connection. It uses the following files:

Disclaimer: This guide is for informational purposes for licensed users facing activation challenges. If you'd like, I can: Explain how to Provide tips on how to avoid data loss in the future Suggest free, legitimate alternatives for data recovery

Now, use a computer that does have internet access to get the final activation file from the official servers. Plug your USB stick into the internet-connected computer.