You can download it directly from the Intel Download Center .
Are you currently missing a (like Wi-Fi or Audio) in the Windows Device Manager ? Intel Atom X5 Z8350 Drivers Windows 10 64 Bit
Run the Intel Graphics installer that you downloaded. You can download it directly from the Intel Download Center
If you are trying to get a Z8350 device running today, ignore the manufacturer's website. The winning strategy is: Intel Atom X5 Z8350 Drivers Windows 10 64 Bit