This is not a plugin, this is an extension, you may have a sync issue with adobe server so you are not able to get your extension, you must be sure your adobe creative cloud app is syncing normally with the adobe server.
First off, thank you for your response. I have checked my adobe creative cloud app but didn't see errors with it. I paused syncing then resume syncing multiple times but nothing happens. I've also uninstalled/reinstalled adobe creative cloud & uninstalled/reinstalled Adobe After effect but the issue still persists. If there is any other troubleshooting you can recommend me to resync my adobe server I would love your input.
Also, I tried doing your ZXP installer but I get a pop up that states "No application compatible with Bodymovin_5.7.1. The same popup occur with a different zxp file as well (LottieFiles for After Effects_0.1.20.zxp). Even if I press "OK" it would just say It was not installed.