Vega 3 is a Integrated Graphics that is part of your Processor.
You need to look under Processor with Graphics and find your processor and download the AMD VGA driver from here: https://www.amd.com/en/support
If you have a laptop then you need to look under "Mobile" processors.
NOTE: If you don't know your Processor's Make & Model download and run CPUID or CPU-Z to find that information.
