So, I solved this myself in the end. Partly by finding bits of this forum dealing with similar issues that pointed to web pages sadly no longer there…
I get that this is free and all, but I would have acutally bought it had I been able to get help with the evaluation process.
Now I need to figure out how to log out, so I’ll have just one more go.
If anyone else is struggling getting going with this and using it with asp net core, this is a link to a new question I have on StackOverflow, but also shows how I got to a nearly working solution.
Link to question.