It’s a little while ago now, but David Arditti gave a memorable review of Hyperstar at the 2011 Deep Sky Section meeting. I happen to remember it because I wrote the meeting up for the Journal.
If you hover over the “Publications” tab at the top of this website, and select “Downloads”, and then go to “Journal Archive”, and then “2011 August”, you can find my write-up of David’s talk starting on page 245.
I don’t know whether the technology has moved on since 2011, or whether David’s opinions have changed, but the impression he gave seven years ago was that Hyperstar was a bit of a nightmare to install / use!
Another Hyperstr user is Grep Parker who spake at last years Deep Sky Section meeting – though not all about the Hyperstar, though he did mention it in the task. Hopefully this to the video link will work: https://britastro.org/video/7951/9337