Hi Paul,
you might be interested in trying NINA - It's a free open source alternative to SGP with identical functionality, but with much better dev support (hop on the discord if you have any issues). It runs everything in paralell (much faster than SGP!) and it also does AF identical to SGP, if not a bit faster too. The UI is far more intuitive too. I highly reccomend it! At the moment there are at least 100 people running NINA worldwide!
https://nighttime-imaging.eu/