I'm also unable to start BTT like CVarela described.
If I try to launch it, it crashes. I then see a dialog asking I would like to send a report to apple. It provides the following details:
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler 
Application Specific Information:
Crashing on exception: -[NSFlippableView(0x7fce549a0270) lockFocus] failed with window=0x0, windowNumber=0, [self isHiddenOrHasHiddenAncestor]=0
I'm on the alpha channel and have only started seeing this problem a few days ago after updating. I'm unable to switch off alpha (since I can't open up BTT settings).
I also tried following the steps in the solution linked above. I already had these settings enabled, and trying to disable them caused my computer to freeze and required a hard restart.
Let me know if I can provide any more information and thank you for any help!
EDIT: I tried removing BTT from my Privacy>Accessibility apps, then added it again, and after that was able to launch the app again. @CVarela maybe that would help you as well?