if that is a desktop machine not a laptop then I can upload the nvidia drivers for you, just make sure it’s not a laptop as the regular nvidia drivers do not work with optimus laptops and as I said the name of you card 820m makes me think it’s a mobile ie on a laptop, for laptops you need bumblebee.
edit
if you don’t mind doing the hard install you can find the regular nvidia driver online
just search for
NVIDIA-Linux-x86_64-361.42.run
you can use a vpn or this Firefox addon