For those die-hard Flash Builder fans out there, like myself, I finally switched to IntelliJ and installed the consistenly updated Flash/Flex plugin. Was forced when I moved to Apple Silicon, but so far so good. Harman, which has taken over updating the AIR SDK has decent setup guides if needed. (https://airsdk.dev/docs/basics/setup-an-editor). Apache Royale is looking promising as well. No affiliation with any companies, just stubborn on using anything else and/or wildly different.