If you cannot afford a Windows license, consider installing (e.g., Ubuntu, Linux Mint, Zorin OS). These are completely free, secure, and user-friendly. Many Linux distributions look and feel like Windows, and they run well on older hardware that originally shipped with Windows 8.1.
If you are looking to install or activate Windows 8.1 safely, consider these methods: Use a Genuine Key removewat+226+windows+81+install
To activate Windows 8.1 legally, you need a valid 25-character product key. If you do not have one, you should transition to a modern, supported version of Windows, as Microsoft has ended support for Windows 8.1. You can find information on current versions via the official Microsoft Windows site . If you cannot afford a Windows license, consider
Are you running into a during activation that I can help you troubleshoot? online & Microsoft Support Product Activation Portal If you are looking to install or activate Windows 8