Alright so I took a look at this on my side and just doing first aid on the disks doesn't help.
Since I'm not comfortable with changing the startup security to high (it bricked my computer 3 times when I did that during Catalina Beta) I tried something that sounded more safe and doesn't require any changes to your system...
Restart your computer and hold the shift key to boot into safe mode and then start the update from there.
Worked wonders for me with startup security to none...
I'm now on Beta 2 :D
GoD Brutus
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Alright so I took a look at this on my side and just doing first aid on the disks doesn't help.
Since I'm not comfortable with changing the startup security to high (it bricked my computer 3 times when I did that during Catalina Beta) I tried something that sounded more safe and doesn't require any changes to your system...
Restart your computer and hold the shift key to boot into safe mode and then start the update from there.
Worked wonders for me with startup security to none...
I'm now on Beta 2 :D
@tekn0l0gika
Did you try to do the install in safe mode?