Hi, version 7 is no longer available for download in the public repository. If you have a customer Id, you can reach out to the support team and ask for a download.
Balloon notifications are used to notify as well as prompt the desktop user to accept a specific function (e.g accept an incoming connection) and are a central security feature of NoMachine software. Whilst in version 7 it is possible to disable all balloon messages using the appropriate key in node.cfg, in version 8 the disabling of all balloon messages is no longer possible.
In v9, it will be possible to remove sensitive information such as IP address and username in the server GUI from the balloon notifications, so that more generic message will appear e.g., “A user is connecting to your machine”.