: You can temporarily reset the activation period by running slmgr -rearm as an administrator in the Command Prompt, which resets the 30-day grace period.
During the lifecycle of the OS, users purchased retail keys. Now, moving to a modern, supported operating system is the most secure way to ensure your PC remains protected against modern vulnerabilities.
If you want to transition your older system to a modern platform, tell me: What are the of your current computer?