Convert Filemaker 18 Runtime To macOS App

I’d like to convert a Filemaker 18 Runtime to a Mac (Catalina) application package.

I found a youtube video that describes how to do this

# FileMaker Runtime Packages and Installer

but it’s 13 years old, so I don’t know whether my failure to get it to work is due to the technology having moved on.

A more recent video describes how to convert a shell script into a Mac OSX App

but I can’t seem to adapt it to package a Filemaker runtime.

Thanks in advance for any advice.