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Since I don't know what Make & Model laptop you have, the only laptop I found from AMD website that uses the CPU and Vega 8 that you mentioned is a HP Envy x360. Here is the link to download the latest BIOS and Graphics drivers for that particular model: HP Software and Driver Downloads for HP Printers, Laptops, Desktops and More | HP® Customer Support
If this isn't your model than once you post your computer spec as mentioned above than maybe someone may be able to assist you.
Somebody asked the same question is January 2018. Here is the link and Kingfish correct answer: Vega 8 Mobile Graphics Driver?