Rolling back your Mac OS would be the sensible option right now. That way you can be guaranteed that you can complete the required work.
Anyone that works in the programming side of the software world will tell you that it's usually impossible to predict with absolute certainty how long it will take to fix an issue.
Berating Adobe for something that is not really their fault, won't help in this case. It was Apple that changed their OS and broke Captivate.
Some of the blame should also be laid at the feet of whoever it was in your own organisation that decided to blindly rush in and update all of your Apple hardware without first doing any kind of preliminary testing.
As I pointed out earlier in this thread, the fact that each new Apple OS is likely to break Captivate has been a "known issue" for years.