If you wanted to create a generic UrBackup client installer for your internet server you’d have to create one yourself following instructions here .
I have made https://installercreator.urbackup.org/ to make this process easier. Given the correct parameters it’ll create a executable for you that’ll create a client on your server, then download the client installer for this newly created client and then run this installer. It’ll use the computer name as default client name, optionally appending a random string, such that name collisions do not occur.