Nothing, it's impossible to install the latest 2.3.2 version on MacOS 10.14.
I've tried also with PVII's extension manager and the result is the same.
I've tried also to install on other DW versions (Dreamweaver 2015) and... nothing.
Instead with other extensions works good and DMXzone extension manager show me correctly the prompt in attachment.
Could you send me the old 2.3.1 version, I need urgently to finish a work.