Wow. I have a 2017 13" MBP and I'm not experiencing ANY of the issues most of you are writing about. In fact, this has been a fairly stable implementation, especially beginning with Dev B3. Dev B4 downloaded quickly and installed quickly. My only call-outs so far are that Time Machine stays in "preparing backup" for an unusual amount of time but finally kicks off as it did in B3. iCloud seems to be running and uploading my photo library more quickly now and I'm not experiencing all the crashes and spindumps associated with the iCloud Photo Library routines. I cannot pinch and adjust photo sizes in the Photos app but I can return them to normal with the slider at the top left of the screen.
Adobe apps and Microsoft Office are running smoothly. The only app I have issues with is the Carbon Copy Cloner beta which does basically...nothing. Home Sharing of music to the iPhone (iOS 13) is still not working but home-shared TV shows and movies play in the iPhones Apple TV app. Home Sharing of music to the iPhone has always been finicky. Music sharing works in the Apple TV public beta but not my TV shows and movies. Go figure.
I can only conclude that those of you with the 2018 hardware who were experiencing issues installing the Dev B3 are having a tough time with this Beta of Catalina and I'm really very sorry this is happening. I cannot figure out why Apple would still be releasing questionable developer betas at this stage. Mojave dev betas ran extremely well it seemed or at least, were much less troublesome.
Adobe apps and Microsoft Office are running smoothly. The only app I have issues with is the Carbon Copy Cloner beta which does basically...nothing. Home Sharing of music to the iPhone (iOS 13) is still not working but home-shared TV shows and movies play in the iPhones Apple TV app. Home Sharing of music to the iPhone has always been finicky. Music sharing works in the Apple TV public beta but not my TV shows and movies. Go figure.
I can only conclude that those of you with the 2018 hardware who were experiencing issues installing the Dev B3 are having a tough time with this Beta of Catalina and I'm really very sorry this is happening. I cannot figure out why Apple would still be releasing questionable developer betas at this stage. Mojave dev betas ran extremely well it seemed or at least, were much less troublesome.