I really don't wanna lie, your device support accessories are outdated. Its really difficult to find the official softwares for your device.
However after a bit of digging I found out its a bit of proceedure to get the instalation of your device drivers. Based on the following thread: ADVENT VEGA USB DRIVER PROBLEM
You might need to find the two tools :
- AUDI - Automated USB Driver Installer
- VegaTools
You need to download the 97MB file (which include the tools, custom rom and drivers) Ignore the ROM files, we just need the USB drivers (containing NvidiaUsb.inf" and the other has: androidwinusb86.cat, androidwinusba64.cat, android_winusb.inf
)
here: r8-vega-update-modacocustomrom
Read full instructions here: ADVENT VEGA USB DRIVER PROBLEM
Credits:
Vega clone USB drivers problem (and bootloop)
Hope this works