@troylyndon, thank you for reaching out. I’ve updated all tools - MacOS Catalina 10.15.4, Xcode 11.5, BBEdit 13.1.1, and Corona Simulator 2020.3579 (2020.3.27). Corona site said that this is the current version recommended and does not support the rest of the OS’s and Xcode that Apple is pushing (I believe).
Testing “Build” on Simulator says
"The version of iOS SDK (13.5) that’s installed on this computer does not match the target iOS version (13.4). You may encounter issues building or incompatibilities at runtime.
You should consider updating your version of Xcode or using xcode-select to enable a compatible version."
If you have any links that could help to sort this out, I would be very grateful for direction. In the meantime, I’ll keep reading. Thanks, again, for the kind words. I really like this community too. I submitted my first app in 2011. Have 8 now. Rough jumping in after hiatus, but that’s on me. I appreciate your positive words and reminder. Best developer community there is.