While there is no official driver, there is a community workaround that allows you to force-install the Windows 7/8 drivers on Windows 10. This is likely what those "Free" download sites are repackaging.
If you must use Windows 10 64-bit, follow these steps to attempt a driver installation using legacy files or the Intel Driver & Support Assistant : Intel Atom N2600 Graphics Driver Windows 10 64-bit -FREE-