GDAL & Python 3 environment variable

Newbie here. I’ve just loaded OSX Catalina on my iMac. I’ve installed GDAL 2.4 complete from the Kyngchaos site. The install works great for all GDAL commands except for the python ones (gdal_polygonize.py for example). Then I get this error:

-bash: /Library/Frameworks/GDAL.framework/Programs/gdal_polygonize.py:/Library/Frameworks/Python.framework/Versions/3.6/bin/python3: bad interpreter: No such file or directory

The python version I’m running is python 3.7.5

In my system there is no /Library/Frameworks/Python.frameworks folder. Instead, it seems to be here:
/usr/local/bin/python3.7

However, my PATH variable includes this folder:

/Library/Frameworks/GDAL.framework/Programs:/Library/Frameworks/PROJ.framework/Programs:/Library/Frameworks/SQLite3.framework/Programs:/Library/Frameworks/UnixImageIO.framework/Programs:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

What am I doing wrong? how do I fix this?