Next time, before you update, copy the Logic app to another drive and rename it Logic 10.4.x
This way you can always revert.
Thanks, but is there anything I can do now?
Can I get hold of 10.4.1 from somewhere?
Everyday brings a new way of Logic to crash. Just now Logic stayed open but all the windows disappeared and were also grey'd out in the dropdown menu. I forced quit but unlike other times, on relaunch there was no option to use an auto-save version so I lost a lot of work for good.
If this goes on it's bye bye Logic for good! I've used it for a decade and never have I had such issues!