I failed to update a SmartSolar MPPT 100/30 from 1.56 to 1.59 on a MacBook with Mac OS Catalina, so I took an old MacBook with Mac OS Mojave and tried it on that. And it worked flawlessly. Somehow the code is broken for Mac OS Catalina 10.15.7.
Has anyone else experienced the same issue? I don't want to take 2 MacBooks in the field.