Hi @Mel,
Welcome to Discourse!
Unfortunately I have some bad news. My node-red-contrib-rtsp-client has never been published on NPM, so it isn't available in the Node-RED palette. You need to install it directly from my Github repository. I have updated the installation instructions in the readme page on the link above.
But be aware that I won't be supporting that node anymore. I have been developing a series of video related nodes over the years, but there was no interest from our community to contribute. So a few weeks ago I have finally decided to quit with video processing inside Node-RED, and abandon all these nodes. Now I am trying to get Frigate running outside Node-RED (see this discussion).
Bart
