There are 3 very similarly named tools, one of them is newer and had a PR open as of April 1st 2020, has since been merged, but a lot of guides/tutorials/'get started' information is seemingly outdated.
I resolved this by using the 'dev' version specified in this reddit thread
https://www.reddit.com/r/grpc/comments/ih5qn5/undefined_grpcsupportpackageisversion7/
https://stackoverflow.com/questions/61666805/correct-format-of-protoc-go-package
After I got past some of the issues I was having with the proto(buf) tooling I found this article/guide and decided to use the project layout and implement the example 'service' DB api, as it seemed a good one to learn as I typed out and edited later on.
There are some small code differences as I make use of the latest go-redis/redis version (v8) but nothing huge.
Credit: https://medium.com/@felipe.infantino.moreno/microservice-in-golang-using-redis-and-grpc-865587aa260c