I'm a new user and this is the first time in the community.
It is easy to target Adobe application.
This is best for beginner and for experts as well.
The OP asks for editor 64bit
ExtendScript toolkit is a 32-bit application and with macOS 10.15 (Catalina), which supports only 64-bit applications, the ExtendScript Toolkit does not open.
OP din't mentioned operating system.
If he/she is using windows, ExtendScript Toolkit is the best editor in such a case.
Or else write code in other machine using ExtendScript Toolkit and put JSX/JSXBIN file in script panel run it.
Just in case it isn’t clear there are two parts you have to download. Download and install Visual Studio Code, and then from the Visual Code app install the ExtendScript Debugger plugin.
Also, if you are trying Visual Code on an earlier OS where ESTK is running, you have to quit ESTK. Visual Code will not work while ESTK is running—I had to quit ESTK and restart my OS in order to get it running.