Apple released Catalina Developer Beta 7 yesterday. I have installed it on my external Catalina SSD. It runs really well. All of my mission critical Apps work just fine in Beta 7. Did I say it was really fast? Of course, this is on a drive without a lot of Apps, not much baggage. Nevertheless, it appears to be really snappy. I am looking forward to its release and am wondering if this is the last Beta before that happens.