The AMD software for the AMD Radeon Vega 3 graphics card is called the AMD Radeon Software. You can download the latest version of the software from the AMD website by following these steps:
It is important to note that the AMD Radeon Vega 3 is integrated graphics card, it may be part of the APU (Accelerated Processing Unit) and the software you need is the one for the APU itself.
Please make sure you follow the instructions on how to install the software properly and also check if there's a newer version of the software.
Here is the direct link where you can download the drivers for the APU with integrated Vega 3 graphics: https://www.amd.com/en/support/apu/amd-a-series-apus/amd-a4-series-apus-for-desktops/a4-9120
Please select your operating system and download the corresponding package.