Bad CPU type in executable
I have this problem running flutter doctor "Bad CPU type in executable"
You are using a version of the app that is not compatible with your Mac. It may be that the app you are trying to use is compiled for a 32 bit CPU which are no longer supported on macOS 10.15+.
32-bit app compatibility with macOS High Sierra 10.13.4 and later - Apple Support
Make sure the app you downloaded is compatible with the Mac's hardware and that you are using a 64bit version of the app.