I'm sorry to hear that you've been having so much trouble with JuiceboxBuilder-Pro.
Here are a few notes which should hopefully help.
I added the code in terminal...
the Terminal App lines (noted here) were required to overcome an issue that was present in AIR when Catalina was first introduced.
Harman (the developers of AIR) have since fixed this issue and the Terminal App lines are no longer required with more recent versions of AIR.
Please be sure to use the latest version of AIR with WebKit support. (WebKit is the embedded browser that JuiceboxBuilder-Pro uses for the live preview of the gallery on the 'Customize' panel.)
This is currently AIR v33.1.1.744 which can be downloaded from the foot of the AIR download page here: https://airsdk.harman.com/runtime
Here is a direct link to the Mac version:
Mac: https://airsdk.harman.com/assets/downlo … obeAIR.dmg
(Harman removed WebKit from more recent versions of AIR and if you were to use the very latest version (currently AIR v33.1.1.932), you might run into one of the problems documented here.)
Also, as you have a Mac with M1 hardware, you may need to open JuiceboxBuilder-Pro using Rosetta.
This is noted as a Known Issue on the AIR download page (link above) and it's also mentioned here in our forum.
I hope these notes help you to get JuiceboxBuilder-Pro up and running.