Don't use built in updater, this will unregister NetBarrier.

NetBarrier is the Internet security solution for Macintosh computers.
It offers thorough protection against intrusions coming across a
network, whether the Internet or a local AppleTalk network.

NetBarrier protects your computer from intrusions by constantly
filtering all the activity that enters and leaves through the Internet
or a network. You are protected against thieves, hackers and
intruders, and warned automatically if any suspicious activity occurs.

NetBarrier's Personal Firewall protects and monitors all incoming and
outgoing data. A customized mode allows you to create your own defense
rules, offering the most secure level of protection.

NetBarrier's Antivandal blocks all attempts to break into your Mac,
detects wrong passwords and logs vandal attacks for complete
protection. Moreover, it has an alarm to inform you of every intrusion
attempt.

NetBarrier's Internet Filter analyzes data as it leaves your computer
and prevents unauthorized exporting of private information such as
credit card numbers, passwords, sensitive data and more...

NetBarrier's Internet Privacy feature helps maintain your privacy,
giving you control over cookies, blocking ad banners and blocking spam
before you even download it.

NetBarrier also helps cover your tracks, by refusing to give out
certain personal information.

Include: Manuals and Remover.

Compatibility
Architecture: PPC

Mac OS 8.1 or later
PowerPC
Open Transport
16 MB memory
5 MB free disk space
Internet Config 1.1 or higher
Screen resolution 800 x 600 or higher