See Download your Creative Cloud apps for detailed steps to download and install your Creative Cloud apps.
These installers will not work on Mac OS Catalina 10.15.
If you need to revert your operating system to install your apps, download Mac OS Mojave from the Apple Support website.
* You can install Extendscript Toolkit CC on macOS 10.11.5 or earlier.
If you get an error message while installing the app, see Troubleshoot download and install errors for troubleshooting steps.