Problems getting rtl8812au driver for Mint 19.3

I'm a senior and have minimal knowledge of computers (so please talk to me like a 3rd grader). I've been using Windows 7 for a few years and want to switch to Linux Mint. I managed to download a portable copy of Cinnamon 19.3 onto a 128GB USB using Rufus. At least temporarily, I want to use it on the USB and keep Windows 7 on the hard drive for emergencies. Unfortunately, I can't get on the internet with LM yet. I have an eMachines PC but only have access to wifi now and use a Netgear internet adapter (A6100). It works fine for Windows but not LM. Is there a way I can download the driver I need (rtl8812au) for Linux on Win7 and transfer it to Linux Mint Cinnamon 19.3? Please don't get overly technical. I just learned what a terminal window is! Thanks so much in advance.