Driver for adapater RD9700 usb 2.0 fast ethernet

You will need to contact the mfr/seller of that product. Personally, I've never heard of an adapter needing a driver with a Mac.

Apple has several different options in the online store:

https://www.apple.com/shop/product/MC704LL/A/apple-usb-ethernet-adapter

https://www.apple.com/shop/product/MD463LL/A/thunderbolt-to-gigabit-ethernet-adapter

And these are the instructions on how to install these:

https://support.apple.com/lv-lv/guide/mac-help/mh11939/mac

Okay. Adapters for Macs are usually plug and play.

You will need to contact the mfr or take a look at these instructions (no idea if they work in whatever OS you are running).