Am trying to install rust:io clans but it keep saying this as i add the plugin

[Rust:IO Clans] Rust:IO is not present. You need to install Rust:IO first in order to use this plugin!

I don't understand why i need to download this?

I saw your reply to another guy a year ago saying
"

This plugin uses the Rust:IO extension, which is only on playrust.io.

Wulf, the first time i added it it worked perfectly and i didn't have rust:io
i deleted it by mistake and redownloaded and this error shows up now

I downloaded after that Rust:io and added into foldor RustDedicated_Data/Managed but still it's not working kindly help me