The latest version is available here: https://forum.audacityteam.org/t/chris-capels-dynamic-compressor/20241/1
There are a couple of different versions available (see the first and third posts in that thread). A version that is optimised for the current version of Audacity will probably be released in due course and hosted on the Audacity wiki, but for the present you could try the different versions and use whichever you prefer.