To check if your Windows 8 laptop is compatible with Windows 10, you can use the Windows 10 Upgrade Assistant. This tool will scan your system and let you know if there are any compatibility issues.
If your laptop is compatible with Windows 10, you can still upgrade to Windows 10 for free by using the assistive technologies upgrade offer. This offer is intended for users who require assistive technologies, but Microsoft does not verify if you actually use these technologies, so anyone can take advantage of it.
To do so, go to the Microsoft accessibility website and click on the "Upgrade now" button. This will download the Windows 10 Upgrade Assistant, which will guide you through the process of upgrading to Windows 10. Note that this offer may expire at any time, so it's best to take advantage of it as soon as possible.