We release major and minor updates to Traffic Manager on a periodic basis, and you are strongly advised to maintain production instances of Traffic Manager on recent releases for support, performance, stability and security reasons.
Where to find updates
Software and Virtual Appliance updates are posted on the http://my.pulsesecure.net site, and updates are announced on the community pages, such as this article.
The update process is designed to be straightforward and minimizes disruption, although instantaneous downtime is inevitable. The process depends on the form factor of your Traffic Manager device:
You can easily verify if you're running the software-only install (installed on your Linux/Solaris host) or a Virtual Appliance (running on VMware, Xen or another platform) by checking the header of an admin server page:
Software install - identifies itself as "Traffic Manager 4000 VH"