UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
If I am shooting one series at higher ISO and another series at lower ISO, is it generally better to process them separately and then layer them in another program or process them all in a single session on APP. Still pretty new to APP and haven't found the right balance in luminosity of various parts of the shot when processing them all at once. The end I want to get to is to keep crisp stars I get with lower ISO combined with the nebulosity I get with the higher ISO series; just trying to figure out the best path to get there.
@leolibbey APP is not capable yet of HDR compositions like what you are looking for. The next version will have a star extraction tool such that the stars and the background can be processed separately and that will be the first step towards true HDR processing. So until then it's better to integrate the two sets of lights separately and combine them in another tool.
Thanks! The star extraction tool sounds great. Any estimate on when that version is planning to be released?