irrealix After Effects plugins is compatible with AE CC2017 and later versions. Available for MacOS and Windows.
The best way to install a plugin is to use aescripts Manager app. This will automate installation and registration process.
If you need for some reason to install plugin manually, download plugin and unzip it to your hard drive.
From folder Windows copy file Volna.aex to folder:
From folder macOS copy file volna.plugin to folder: