How to install Lottiefiles Plugin 0.1.20.zxp.json

this is my first time using lottiefiles plugin for after effect.
I followed the instructions to download the file Plugin, but the downloaded file is “Ae-Plugin 0.1.20.zxp.json”, not the same as the file “ae-plugin.zxp” in the instruction clip
So how can I install this plugin?

This is the installer I use.